Question

Ball A is thrown up vertically with speed 10m/s at the same instant another ball B is released from the rest at height h.at time t the speed of A relative to B is

Answer 1

At time t,

speed of a= 10 – gt

 

speed of b = 0 – gt

 

Speed of a relative to b = 10 – gt + gt = 10m/s
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Answer 2

Answer:

for ball A

v =10 - gt

for ball B

u = 0

v =0 + gt

for relative velocity we know

Va - Vb = Vrelative

=10 - gt + gt

= 10. answer