The mass of a student sitting in the bus is 80 kg. The bus is traveling at speed

Question

The mass of a student sitting in the bus is 80 kg. The bus is traveling at speed 65 mph in respect to the road (1 mile = 1600 meters).

Problem 3

What is the magnitude of momentum of this student in the reference frame in which the road is at rest (i. e. in respect to the road)?

A) 5200 kg .m/s B) 1.23 kg .m/s C) 2.77 kg .m/s D) 2310 kg .m/s E) 0 kg .m/s

Problem 4

What is the magnitude of momentum of the student in the reference frame in which the bus is at rest?

A) 5200 kg .m/s B) 1.23 kg .m/s C) 2.77 kg .m/s D) 2310 kg .m/s E) 0 kg .m/s

Explanation / Answer

3: v = 65 mph = 65 x 1609 m / 3600s

v = 29 m/s

momentum = m v

= 80 x 29

= 2324 kg m/s

Ans(D)

4: v = 0

momentum = 0

Ans(E)

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