Question

When thrown vertically upward, box covers a distance of 30 meters. Find the initial velocity of the box, time taken by it to reach the ground and its final velocity.(g=10m/s)

Answer 1

V is 0

D = 30 m

Let time be t

D = (v²- u²)/2a

D=( 0²-u²)/2×9.8

u²= 30×2/9.8

u²= 60/9.8

u²=6.12

u =2.47

u = 2.5 m/s (approximately)

t = v-u/a

t = -2.5/-9.8

t = 2.55

t = 2.5 sec ( approximately