Question

Rank the following in terms of increasing momentum:

A. a 10,000 kg train car at rest
B. a 100 kg person running at 5 m/s
C. a 1200 kg car going 15 m/s
D. a 15 kg meteor going at a speed of 1000 m/s

Answer 1

Answer:

Ranks based on momentum are  

1. 1200 kg car going at 15 m/s.

2. 15 kg meteor going at a speed of 100 m/s.

3. 100 kg person running at 5 m/s.

4. 10000 kg train car at rest.

Explanation:

Product of a body’s mass and velocity gives the value of its momentum. It is given by the equation  

$P=mv$

where is the mass of the object and is the velocity.

Calculating the values of momentum:

1. mass= 1200 kg, velocity= 15 m/s

$p=mv =1200 \times 15 = 18000 \ kg \ m/s$

2. mass= 15 kg, velocity= 1000 m/s

$p= 15 \times 1000 = 15000 \ kg \ m/s$

3. mass= 100 kg, velocity= 5 m/s

$p= 100 \times 5 = 500 kg \ m/s$

4. mass= 1000 kg, velocity= 0 m/s

$p= 10000 \times 0= 0 \ kg\ m/s$

Answer 2

Answer:

C. a 1200 kg car going 15 m/s

D. a 15 kg meteor going at a speed of 1000 m/s

B. a 100 kg person running at 5 m/s

A. a 10,000 kg train car at rest

Explanation:

Momentum is the amount of kinetic energy that an object has, it depends on the amount of mass and the velocity at which the object is moving, so if you have an object at rest, it would have zero momentum, so the one with the most momentum would be the heaviest quickiest, and that one would be a 1200 kg car at 15 ms. then the 15 kg meteor at 1000 ms, then the 100 kg person at 5 m/s and last the train car at rest.