A 40 g ball dropped from a certain height bounces back from the horizontal ground without losing mechanical energy. If its speed is 10 m/s just before making contact with the ground, and the average v

Question

A 40 g ball dropped from a certain height bounces back from the horizontal ground without losing mechanical energy. If its speed is 10 m/s just before making contact with the ground, and the average value of the force of the ground on the ball is equal to 16 N while ball and wall are in contact, how long were they in contact?

Options:

Answer:

B

Solution:

Elastic bounce: velocity reverses, so $∣Δ p ∣ = 2 m v = 2 \times 0.04 \times 10 = 0.8 kg m/s$ .

$t = \frac{0.8}{16} = 0.05 s = 50 ms$

Ans. (B)

TestHub · Accepted Answer

Elastic bounce: velocity reverses, so ∣Δ p ∣ = 2 m v = 2 × 0.04 × 10 = 0.8 kg m/s . t = 16 0.8 ​ = 0.05 s = 50 ms Ans. (B)

Physics - Center of Mass Question with Solution | TestHub

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