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

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

Grade:11

5 Answers

Hasan Naqvi
97 Points
8 years ago
At time t,
speed of a= 10 – gt
 
speed of b = 0 – gt
 
Speed of a relative to b = 10 – gt + gt = 10m/s
khushi jangir
14 Points
6 years ago
speed of a,v1=10-gtspeed of b,v2=0-gt =-gtspeed of a relative to b=v1+(-v2) Vab=10-gt+(-(-gt)) Vab=10-gt+gt Vab=10m/s
Argha Das
38 Points
6 years ago
But why the manitude of v2 is 0-gt? In this case ball b is in downward direction. So g is +ve. Please tell me as early as possible. I can not understand this in second case of your answer.
Rudrajit Mandal
24 Points
6 years ago
because here the direction is seen wrt ball a i.e. upward direction is positive. so even though ball b is accelerating it will be taken as -g
Arya
11 Points
5 years ago
V of a= 10+gt. ( Taking upward direction as +ve)
V of b= 0+(-g)t = -gt
We know that relative v = v of a- v of b
But here both the velocities are opposite to each other in directions so take one of them as -ve ( here taking v of b as -ve)
So relative velocity= v of a -(-vof b)
= 10+gt +(-gt)
=10m/s

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