Question Detail

PHY 101 PHY 101 Past Questions Objective Question
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Question

Suppose you throw a ball with a mass of 0.40 kg against a brick wall. If it hits the wall moving horizontally to the left at 30 m/s and rebounds horizontally to the right at 20 m/s. Find the impulse of the net force on the ball during its collision with the wall.
Options
A 4 N·s
B 20 N·s
Correct Answer
C 8 N·s
D -4 N·s
Correct Answer

Option B is the correct answer.

Detailed Explanation

Impulse = change in momentum. Take right as positive. Initial velocity = -30 m/s, final = +20 m/s. Δp = m(v_f - v_i) = 0.40(20 - (-30)) = 0.40(50) = 20 N·s.

Hint

Impulse = Δp = m(v_f - v_i).

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 910 of 1250
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