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IKITE VICTERS ONLINE CLASS 11-10 - 2021, , 2. A hockey ball of mass 200 g hits on a hockey stick with a velocity, 10 m/s. Calculate the change in momentum if the ball bounces, back on the same path with the same speed., , Mass m = 200 g = 200/1000 kg = 0.2 kg, Velocity v = 10 m/s, , Change in momentum = 2 mv = 2 x 0.2 x 10 = 4 kgm/s, , * Children taking rides in amusement parks. They would come with, high speed from a height and would again move up to another, height easily. Why?, , > When coming from heights, the velocity will be very high. Thus, the momentum will also be high. Due to this high momentum, they can move to another height., , Newton’s Second Law of Motion, , The rate of change of momentum of a body is directly proportional, to the unbalanced external force acting on it., , Assignment, , 3. A loaded lorry of mass 12000 kg moves with a velocity of 12 m/s., Its velocity becomes 10 m/s after 5 s., , a) What is the initial momentum and what is the final momentum ?, b) What is the change in momentum?, , c) What is the rate of change of momentum?