Question

A ball of mass 1kg is dropped from a height of 5m. (a) Find the kinetic of the ball just before it reaches the ground (b) What is the speed at this instant?

Answer 1

Correct Answer - A::B
(A) `E_k = E_p = mgh =(1kg)(10m//s^2)(5m) =50J`
(b) as `E_k = (1)/(2)"mv^(2) = upsilon = sqrt((2E_k)/(m)) = sqrt((2xx50J)/(1kg)) = 10m//s`