Question

a balloon is at a height of 81m and is ascending at a velocity of 12 m/s.a body of 2kg is dropped from it.if g=10m/s2 , the body will reach the surface of the earth in how much time

Answer 1

Hey.

Here is the answer.

Height if the balloon or the 2kg body,s = 81m

velocity while dropping , u = -12m/s (as upwards)

As, s = u t + 1/2 g t^2

or, 81 = -12 × t + 1/2 ×10×t^2

or, 81 = -12t + 5t^2

or, 5t^2 -12t -81 = 0

so, t = 5.4 sec. { solving the quadratic}

So, it will take 5.4 second to reach the ground.

Thanks .

Answer 2

Answer:

answer of this question is 5.4 s....