We are given that
Mass of dump bell (m) = 10 kg
Initial velocity (u) = 0 Let final velocity be v.
Distance (s) = 80 cm= \(\frac{80}{100}\) = 0.8m
Acceleration (a) = 10 m/s2
From third equation of motion,
v2 = u2 + 2 as
⇒ v2 = 0 + 2 x 10 x 0.8
⇒ v2 = 16
⇒ v = 4m/s
Momentum of dumb bell transformed to the ground = mv
= 10 x 4 = 40 kg m/s