Sindh Textbook physics Class X Chapter No. 6 Sindh Hyderbad

1. SuperbAcademy
SuperbinEducation
Assignment# 03 Physics Class X
Engr:KashifAli Magsi
1) An object, initially at rest, moves with a constant acceleration of 10 m/s2. How far will it travel in (a) 2.0
s and (b) 4.0 s? If this object had an initial velocity of 4m/s, how far will it travel in (c) 2.0 s and (d) 4.0
s? (Ans: (a) 20m (b) 80 m (c) 28 m (d) 96 m )
2) An object moving with constant acceleration changes its speed from 20 m/s to 60 m/s in 2.0 s. (a) what is
the acceleration? (b) How far did it move in this time? (Ans: (a) 20 m/s2 (b) 80 m )
3) A ball is thrown down vertically with an initial speed of 20 m/s from a height of 60 m. Find (a) its speed
just before it strikes the ground and (b) how long it takes for the ball to reach the ground. Take g = 10
m/s2. ( Ans: (a) 40 m/s (b) 2 sec )
4) Average velocity and instantaneous velocity are generally different quantities. Can they ever be equal for
a specific type of motion? Explain.
5) If the velocity of a particle is nonzero, can its acceleration be zero? Explain.
6) Is it possible to have a situation in which the velocity and acceleration have opposite signs?
7) Can a body be said to be at rest as well as in motion at the same time?
8) Two balls of different masses (one lighter and other heavier) are thrown vertically upward with same
initial speed. Which one rises to greater heights?
9) Is it possible that the average velocity of a particle is zero when its average speed is not zero?
10) The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the
dark, estimate the time it takes the nerve impulse to travel to your brain. (Assume that you are
approximately 1.7 m tall and that the nerve impulse travels at uniform speed.) ( Ans: 0.017 sec)
11) A boy standing in front of a high step rock claps once and hears the echo of his clap after 2.5 seconds. If
the velocity of sound is 340 m/s, find the distance of the boy from the rock. (Ans: 425 m)
12) A radar signal is beamed towards a planet from earth and its echo is received seven minutes later. The
distance between the planet and earth is 6.3 × 10 10 m. Find the velocity of the signal.(Ans:1.8 ×1010 m/s)
13) Noman hits volleyball so that it moves with initial velocity of 6 m/s straight upward. If the volleyball
reaches at 2 m above the floor, how long will it be in the air before it strikes the floor? (Ans: 1.23 sec )
14) A body moves over one fourth of a circular arc in a circle of radius r. The magnitude of distance
travelled and displacement will be respectively
15) How far does the runner whose velocity-time graph is shown in figure,
travel in 16 seconds? The figure’s vertical scaling is set by vs=8 m/s.

2. SuperbAcademy
SuperbinEducation
Assignment# 03 Physics Class X
Engr:KashifAli Magsi
16) What does the speedometer measure kept in motorbike?
17) A body starts its motion with zero velocity and its acceleration is 3m/s2. Find the distance travelled by it
in fifth second. (Ans: 13.5 m)
18) Light takes 8½ min to travel from the Sun to the Earth. The velocity of light is 3 00,000 km/s. Find the
distance of the Sun from the Earth. (Ans: 1.53 ×1011sec )
19) If a stone and a pencil are dropped simultaneously in vacuum from the same height, which of the two will
reach the ground first?
20) A point moves quarter of a circle on the circumference of a circle of radius R. Find the distance travelled
and displacement in terms of R.
21) A stone thrown vertically upwards takes 3 s to attain maximum height. Find the
(i) Initial velocity of the stone (Ans: 29.4 m/s)
(ii) Maximum height attained by the stone (g = 9.8 m/s2) (Ans: 44.1 m)
22) The velocity of a car increases from 5 m/s to 17 m/s in a period of 6 s. Then, the velocity of the car
reduces to 5 m /s in a further period of 8 s. Calculate the acceleration and retardation of the car.
(Ans: a=2 m/s2 , a=-1.5 m/s2)
Submit on 25-08-16
So verily, with the hardship, there is Relief.
Verily, with the hardship, there is Relief.
(Quran 94: 5-6)