A child drops a ball from a bridge. The ball strikes the water under the bridge 2.0 seconds later. What is the velocity of the ball when it strikes the water? Solution V=U+AT=0+32*2=64 FT/SEC...OR IN MKS UNITS.... V=0+9.8*2=19.6 M/SEC SEE BELOW FOR EXPLANATION A boy throws a rock straight up into the air. It reaches the highest point of its flight after 2.5 seconds. How fast was the rock giong when it left the boys hand? 1 solutions Answer 17643 by venugopalramana(1171) About Me on 2006-03-21 11:25:11 (Show Source): THE FORMULA TO BE USED IS V=U+AT...WHERE V=FINAL VELOCITY....FT/SEC. U=INITIAL VELOCITY....FT/SEC. A = ACCELERATION ..HERE IT IS DUE TO GRAVITY WHICH IS ACTING AGAINST THE MOTION ..ITS VALUE IS -32 FT/SEC.SEC. T=TIME OF TRAVEL...SEC WE HAVE U=? V=0....AS IT REACHED THE HIGHEST POINT AND WILL STOP AND FALL BACK FROM THERE. T=2.5 SEC. 0=U-32*2.5 U=32*2.5=80 FT/ SEC. IF YOU ARE IN MKS UNITS THEN A=-9.8 M/SEC.SEC U=9.8*2.5=24.5 M/SEC.