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Chapter 9: 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

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

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

02

Explanation

Calculate the kinetic energy using K.E.=0.5脳m脳v2............................(1)

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

KEbullet.=0.5脳m脳v2KEbullet=0.5脳0.010脳5002=1250J

Similarly

KEstudent=0.5脳m脳v2KEstudent=0.5脳75脳5.52=1134.38J

We can see KEbullet > KEstudent

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