A ball rebounds with same speed after hitting wall. What type of collision?

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A ball rebounding with the same speed after hitting a wall is an example of an elastic collision.

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Asked 19 days ago|1/25/2026 8:48:04 AM

Updated 19 days ago|1/25/2026 9:44:49 AM

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yumdrea

A ball rebounding with the same speed after hitting a wall is an example of an elastic collision.

Added 19 days ago|1/25/2026 9:44:31 AM

This answer has been confirmed as correct and helpful.

cruz30

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Added 19 days ago|1/25/2026 9:44:49 AM

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Deleted by cruz30 [1/25/2026 9:44:54 AM]

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A 1.5 kg mass has momentum 9 kg·m/s. Find kinetic energy.

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Updated 19 days ago|1/25/2026 9:00:21 AM

1 Answer/Comment

cruz30

Given:
m = 1.5 kg
p = 9 kg·m/s
v = p / m
v = 9 / 1.5 = 6 m/s
KE = (1/2)mv²
KE = 0.5 × 1.5 × 6²
KE = 27 J

Added 19 days ago|1/25/2026 9:00:21 AM

This answer has been confirmed as correct and helpful.

A body moves with constant acceleration 2 m/s . If initial velocity is 4 m/s, find velocity after 8 s.

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Updated 19 days ago|1/25/2026 9:01:48 AM

1 Answer/Comment

cruz30

Given:
u = 4 m/s
a = 2 m/s²
t = 8 s
v = u + at
v = 4 + (2 × 8)
v = 20 m/s

Added 19 days ago|1/25/2026 9:01:48 AM

This answer has been confirmed as correct and helpful.

A stone is projected vertically downward at 5 m/s from a height of 45 m. Find time to reach ground.

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Updated 19 days ago|1/25/2026 9:01:19 AM

1 Answer/Comment

cruz30

Given:
u = 5 m/s
s = 45 m
g = 9.8 m/s²
Equation:
s = ut + (1/2)gt²
45 = 5t + 4.9t²
4.9t² + 5t 45 = 0
t = [ 5 + sqrt(25 + 882)] / 9.8
t = 2.56 s

Added 19 days ago|1/25/2026 9:01:19 AM

This answer has been confirmed as correct and helpful.

A 2 kg object moves with angular speed 10 rad/s in a circle of radius 0.5 m. Find centripetal force.

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Updated 19 days ago|1/25/2026 9:29:27 AM

1 Answer/Comment

cruz30

F = m r ²
F = 2 × 0.5 × (10)²
F = 100 N

Added 19 days ago|1/25/2026 9:29:27 AM

This answer has been confirmed as correct and helpful.

A machine lifts 500 N through 6 m in 10 s. Find power.

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Updated 19 days ago|1/25/2026 9:36:16 AM

1 Answer/Comment

cruz30

W = Fd = 500 × 6 = 3000 J
P = W/t = 3000/10 = 300 W

Added 19 days ago|1/25/2026 9:36:16 AM

This answer has been confirmed as correct and helpful.

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