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Chapter 9: Q. 7 (page 227)

A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move the the right at 30 m/s. How much work is done by the force?

Short Answer

Expert verified

Net work done is zero.

Step by step solution

01

Given information

A 20 g particle is moving to the left at 30 m/s.

A force on the particle causes it to move the the right at 30 m/s.

02

Explanation

Work done by force is given by the Change in Kinetic Energy.

Lets assume

vo be the initial velocity = -30 m/s
v1 be the final velocity =+30 m/s

Now find the work done as Change in Kinetic Energy

W=Change in Kinetic Energy

W=12×m×v12-vo2W=12×20×10-3kg×(30m/s)2-(-30m/s)2W=0J

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