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In this lesson, we will learn how to calculate the kinetic energy of a moving particle of mass m that moves with velocity v.

Q1:

A particle of mass 150 g was projected at 13 m/s across a horizontal plane. It decelerated uniformly at 2 m/s^{2}. Find the change in its kinetic energy in the first 4 seconds of motion.

Q2:

A rubber ball of mass 125 g fell vertically from a height of 3.6 m. It hit the ground and rebounded vertically upward. Given that the change in the ball’s momentum as a result of the impact was 1 . 9 × 1 0 5 g⋅cm/s, determine the change in its kinetic energy. Consider the acceleration due to gravity to be 9.8 m/s^{2}.

Q3:

A body of mass 500 g is moving at a constant velocity , where and are two perpendicular unit vectors. Find its kinetic energy.

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