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. The velocity of a body with a mass of 100 kg increases from 4 m/s to 8 m/s whena force acts on it for 2 s. Answer the following questions:(5 marks)a) Calculate the momentum before the force acts on the body.b) What is the momentum after the force acts on the body?c) What is the gain in momentum per second?d) Calculate the value of the force. |
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Answer» Answer: Mass of the BODY =10 kg Initial VELOCITY u=4 m/s Final velocity v=8 m/s Time t=2s a) Momentum before force ACTS p 1
=m×u=10×4=40kg.m/s b) Momentum after force acts p 2
=m×v=10×8=80kg.m/s c) GAIN in momentum per second = 2 40
=20kg.m/s d) Acceleration a= t v−u
= 2 8−4
=2m/s 2
Force =m×a=10×2 =20N |
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