Question

A body of 5 kg mass is raised vertically to a height of 10 m by a force of 120 N. Find the final velocity of
the body:
(A) 280 m/s (B) 200 m/s (C) 20 m/s
(D) None of these​

Answer 1

Answer:

A)

$\sqrt{280 }$

Explanation:

Hello,

F=MA

120N = 5 kg . a

a = 24 m/s^2

But this a has to also overcome 10 m/s^2 of gravity

Therefore a = 14 m/s^2

Now v^2-u^2=2as

v^2 = 2 a s = 2* 14*10 = 480

Therefore v = rootunder(280).