Question

A ball rolls off the top of a staircase with a horizontal velocity `u m//s`. If the steps are h meter high and b meter wide, the ball will hit the edge of the nth steps, if:
A. 9
B. 10
C. 11
D. 12

Answer 1

Correct Answer - A
a. `0.2n = 1/2 "gt"^2` or `t = sqrt((2 xx 0.2n)/(g))`
` 0.3 n = ut = 4.5 sqrt((2xx0.2n)/(g))`
` rArr n = 9`