Question

A body is dropped from the roof of a building 10 m high calculate the time of fall and the speed with which it hits the ground
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Answer 1

Answer:

speed=14.14m/s

time=1.414sec

Step-by-step explanation:

body is dropped so initial velocity is 0

let speed with it fall is v

acceleration due to gravity is g

from equation of motion

v^2=u^2+2as

v^2=0+2(10)(10)

v^2=200

v=14.14m/s

let time of fall is t

s=ut+1/2at^2

10=1/2(10)t^2

t^2=2

t=1.41sec