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Chapter 9: Q. 1 (page 227)

Which has the larger kinetic energy, a 10 g bullet fired at
500 m/s or a 75 kg student running at 5.5 m/s?

Short Answer

Expert verified

Bullet has larger kinetic energy compared to student.

Step by step solution

01

Given information

Mass of bullet = 10 g bullet and velocity 500 m/s

Mass of student = 75 kg and velocity= 5.5 m/s?

02

2Step2: Explanation

Calculate the kinetic energy using

KE = 1/2(mv2)

Now find the kinetic energy of bullet and students using the equation (1)

KEBullet =1/2(0.010kg)(500m/s)2 = 1250 J

Similarly

KEstudent= 1/2(75kg)(5.5m/s)2 = 1134.38 J

We can see KEbullet> KEstudent

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