Question

from a tower of height 80m A ball is thrown downwards with a speed of 20 m/s 1) find the velocity of with which the ball strikes the ground 2) the time taken to hit the ground take g = 10m/s^2​

Answer 1

Heya, here is your Answer,

1) h = 80m

u = 20m/s

g = 10m/s^2

${v}^{2} - {u}^{2} = 2gh \\ {v }^{2} = 2 \times 10 \times 80 + 400 \\ v = \sqrt{2000 } \\ v = 44.721m$

2)
v = u + gt
(44.7 - 20)/10 = t
t = 2.47 seconds

I hope you got your Answer.

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