Question

A body of mass 500 g is thrown upwas with a velocity 20 m/s and reaches back to surface of
planet in 20 s. Then weight of body planet is
2N

4N

5N

1N​

Answer 1

Explanation:

m = 500g = 1/2 kg

u = 20 m/s

v = 0 m/s

t = 20 s

weight = mass x acceleration

w = m*a

w = m*(u-v)/t ( u at first because upward motion)

w = 1/2 * 20 - 0/20

w= 1/2 * 20/20

w= 2N

hope it helps.....