Question

A body is dropped from a height of 320 m the acceleration due to the gravity is 10 m/s a) how long does it take to reach the ground

Answer 1

Answer:

ITS WILL TAKE 32 SEC

Explanation:

AS

TIME= DISTANCE / SPEED

SO

320/10= 32 SECONDS

Answer 2

Explanation:

Given,

h=320

 mg=10 m/s^2

u=0

Using, v^2−u^2=2gh

or v^2−0=2×10×320=6400

or 

v=80 m/s

This is the velocity with which the body will strike the 

ground.

Again,v=u+gt

or t=v−ug

=80−010=8 sec

Thus, 

(i) 8 sec

(ii) 80 m/s