Question

A ball is moving to the left at a speed of 5 Km/h. A boy kicks the ball in the same direction. What would be the likely speed of the ball? *

(a) 0 km/h

(b) 3 km/h

(c) 5 km/h

(d) 10 km/h​

Answer 1

Answer:

Explanation:

Answer: A 0.060 kg tennis ball, moving with a speed of 5.58 m/s, has a head-on collision with a 0.085 kg ball initially moving in the same direction at a speed of 3.02 m/s. Assume that the collision is perfectly elastic. A) Determine the speed of the 0.060 kg ball after the collision.

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Answer 2

The speed of the ball would likely be 10 kilometers per hour(option D)

• Since the ball is already in motion, its initial velocity is 5 kilometers per hour
• The boy kicking it in the same direction of motion as the ball gives it an accelerating force. This external force imparts additional kinetic energy to the ball
• The acceleration will cause the ball to move to the left with a greater velocity
• Of the options mentioned in the question, only option D is greater than the initial velocity
• Hence, the correct answer is option D
• If the ball was kicked in another direction, the possibilities would have been either that the ball stops moving, slows down, or moves in a different direction with a certain new velocity

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