A ball is projected horizontally and the same time another ball is dropped down from the top of a towera) Both the balls will reach the ground at the same time b) Both will strike the ground with the same velocity

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a is true and b is false

Both a and b are true

a is false and b is true

Both are false

answer is A.

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Detailed Solution

for the first ball is projected horizontally, initial velocity vertical component= uy=0 ; acceleration due to gravity=g=9.8m/s2 for the ball that is dropped down from the top of a tower, initial velocity vertical component= uy=0 ; acceleration due to gravity=g=9.8m/s2 as all physical quantities have same value that are involved in time of flight =T=2hg, hence time of flight is same for both the bodies for the first ball has non zero velocity in horizontal direction; final velocity v=vx2+vy2 for the second ball has zero velocity in horizontal direction; final velocity v=02+vy2 hence final velocities are different

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