Question

A blast bag is dropped from a balloon that is 300 metre above the ground in rising at 30 metre per second the time before the back hits the ground is

Answer 1

Explanation:

Given -

s = 300m

u =0

v =30m/s

t =?

v^2 = u^2 + 2as

30^2 = 0^2 + 2 × a × 300

900 =0 +600a

900/600 = a

a=1.5m/s^2

v = u + at

30 = 0 + 1.5 ×t

t = 30/1.5

t = 20sec

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