Question

A ball is dropped from a tower with a speed of 20 metre per second. How much time will it take to strike the ground? ​

Answer 1

Answer:

Brainly.in

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Secondary School Physics 13 points

A body dropped from the top of a tower acquires a velocity of 20m/s on reaching the ground. Calculate the height of the tower.

Ask for details Follow Report by Nikhilsinghai7733 14.05.2018

U = 0 G = 10m/s²

V = 20/s

V = u+gt

20 = 0 + 10t

t = 2s

ht = ut+1/2gt²

= 0 × 2 + 1/2 × 10 × 10 × 2 =

l

Answer:

The height of the tower will be 20.41 m.

Explanation:

Given that,

Velocity v = 20 m/s

Using equation of motion

v2-u^2=2as

Here, u = initial velocity

v= final velocity

g = acceleration due to gravity

s = height of the tower

The height of the tower will be

20^{2}-0=2\times9.8\times s

s= \dfrac{400}{2\times9.8}

s= 20.41\ m

Hence, The height of the tower will be 20.41