Question

4.
Aballoon is at a height of 81 m and is ascending upwards with a velocity of 12 m/s. A body of 2kg weight is
dropped from it. If g=10m/s, the body will reach the surface of the earth in
(A) 1.5 s
(B) 4.025 s
(C) 5.4s
(D) 6.75 s​

Answer 1

Answer:

use equation

h=ut+(1/2)gt^2

here h=81

u=12

and g=10

now you can easily get value of t.