Question

Moving engine
0.5 m/s
Stationary truck
Track
Before the collision, the toy train is travelling at 0.5 m/s. The train and the stationary
truck both have a mass of 75 g.
Calculate the momentum of the toy train before the collision.
A toy train is rolling at a constant speed on a level track. The train collides with a
stationary toy truck and joins with it.​

Answer 1

Answer:

Moving engine

0.5 m/s

Stationary truck

Track

Before the collision, the toy train is travelling at 0.5 m/s. The train and the stationary

truck both have a mass of 75 g.

Calculate the momentum of the toy train before the collision.

A toy train is rolling at a constant speed on a level track. The train collides with a

stationary toy truck and joins with it.

Answer 2

Concept:

• Linear momentum
• Conservation of linear momentum
• The initial momentum is equal to the final momentum of a system.

Given:

• The initial velocity of the truck u1 = 0
• The initial velocity of the train u2 = 0.5 m/s
• The mass of the train = 75 g = 0.075 kg
• The mass of the truck = 75 g = 0.075 kg

Find:

• The momentum of the toy train before the collision.

Solution:

We know that momentum is the product of the mass and velocity of an object.

p = mv

The momentum of the train before the collision

p = mu2

p = 0.075 * 0.5 = 0.0375 kg m/s

The momentum of the toy train before the collision is 0.0375 kg m/s.

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