Q. 324.1( 17 Votes )

# The velocity of a

Answer :

Mass of the body, m = 10 kg

Initial velocity, u = 4 m/s

Final velocity, v = 8 m/s

Time, t = 2s

(a) Initial Momentum, p1 = mu

= 10 × 4 = 40 kg m/s

(b) Final Momentum, p2 = mv

= 10× 8= 80 kg m/s

(c) Gain in momentum for 2s = p2 – p1 = 40kg m/s

Gain in momentum per second = = 20kg m/s

(d) Acceleration, a = = = 2 m/s2

Force = m * a = 10 * 2 = 20N

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