Question

Problem 9.42 A 154 g baseball moving 29.0 m/s strikes a stationary 5.45 kg brick resting on small rollers so it moves without significant friction. After hitting the brick, the baseball bounces straight back, and the brick moves forward at 1.00 m/s. Find the total kinetic energy before the collision. Express your answer with the appropriate units. Find the total kinetic energy after the collision. Express your answer with the appropriate units.

Name: problem 942 a 154 g baseball moving 290 ms strikes a stationary 545 kg brick resting on small rollers so it moves without significant friction after hitting the brick the baseball bounces st 79012
Uploaded: 2019-05-27T00:15:25-08:00
Duration: 3 min 52 s
Channel: Kai Chen
Description: problem 942 a 154 g baseball moving 290 ms strikes a stationary 545 kg brick resting on small rollers so it moves without significant friction after hitting the brick the baseball bounces st 79012

          Problem 9.42
A 154 g baseball moving 29.0 m/s strikes a stationary 5.45 kg brick resting on small rollers so it moves without significant friction. After hitting the brick, the baseball bounces straight back, and the brick moves forward at 1.00 m/s.
Find the total kinetic energy before the collision.
Express your answer with the appropriate units.
Find the total kinetic energy after the collision.
Express your answer with the appropriate units.

problem 942 a 154 g baseball moving 290 ms strikes a stationary 545 kg brick resting on small rollers so it moves without significant friction after hitting the brick the baseball bounces st 79012

Added by Erin F.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Kai Chen

05/27/2019

Step 1

The mass of the baseball is 154 g = 0.154 kg, and its velocity is 29.0 m/s. The kinetic energy is given by the formula: $K = \frac{1}{2}mv^2$ $K_{baseball} = \frac{1}{2}(0.154 kg)(29.0 m/s)^2 = 64.1 J$ The brick is stationary before the collision, so its kinetic Show more…

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Problem 9.42 A 154 g baseball moving 29.0 m/s strikes a stationary 5.45 kg brick resting on small rollers so it moves without significant friction. After hitting the brick, the baseball bounces straight back, and the brick moves forward at 1.00 m/s. Find the total kinetic energy before the collision. Express your answer with the appropriate units. Find the total kinetic energy after the collision. Express your answer with the appropriate units.