Question

A body is dropped from a height 135m. If after 3s acceleration due to gravity of earth ceases to act then the further time of descent is .......

Answer 1

Answer:

3

Explanation:

After 3’s

position =135-10*3*3*.5

=90

velocity=at

=30

s=vt

time=90/30

Answer 2

Answer:

3 seconds

Explanation:

3s sec------> 30 m

h=135 m

Displacement travelled in 3sec is = 1/2gt^2

1/2g(3)^2=45m

=135-45=90

s=vt

t=s/t=90/30

=3 sec