A ball is dropped from a high rise platform

Asked by admin @ in Physics viewed by 366 People

A ball is dropped from a high rise platform at t=0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t=18 s.What is the value of v ?

Answered by admin @


Distance of 1st ball= S= 1/2 x 10 x 18 
= 1620

Distance of 2nd ball = S' = ut + 1/2gt²
1620 = 12u + 5 x 144
u = 135 - 60
= 75 m/s

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