From the top of a tower of height 200 m, a ball A is projected up with speed `10ms^(-1)` and 2 s later, another ball B is projected vertically down with the same speed. ThenA. Both A and B will reach the ground simultaneouslyB. Ball A with hit the ground 2 s later than B hitting the groundC. Both the balls will hit the ground with the same velocityD. Both will rebound to the same height from the ground, if both have same coefficient of restitution.

From the top of a tower of height 200 m, a ball A is projected up with

1.	From the top of a tower of height 200 m, a ball A is projected up with speed `10ms^(-1)` and 2 s later, another ball B is projected vertically down with the same speed. ThenA. Both A and B will reach the ground simultaneouslyB. Ball A with hit the ground 2 s later than B hitting the groundC. Both the balls will hit the ground with the same velocityD. Both will rebound to the same height from the ground, if both have same coefficient of restitution.
Answer» Correct Answer - A::C::D a,c,d. Total displacement ball A in 2s, `S = ut - 1/2"gt"^2 = 10 xx 2 - 1/2 xx 10 xx (2)^2 = 0` Hence, both A and B will reach the ground simultaneously and strike with the same velocity.

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