Q. 7

A person standing A.

B.

C.

D. the relation between VA and VB depends on height of the building above the ground.

Answer :

The initial energy of the ball A and ball B ( at the top of the building, at the time of throwing is equal since both are at equal height () and thrown with same speed (). That is



The final energy of ball A at ground will be



The final energy of ball B at ground will be



By conservation of energy, Initial energy=Final energy



Since initial energies of ball A and ball B are equal (equation (1)), using equation (2), (3) and (4), their final energies are also equal



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