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Q. 62

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 290

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Short Answer

A ton rail car and a ton rail car, initially at rest, are connected together with a giant but massless compressed spring between them. When released, the ton car is pushed away at a speed of relative to the ton car. What is the speed of the ton car relative to the ground?

in the opposite direction to .

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Step by Step Solution

Step 1: Given information   

We need to find the the speed of the car relative to the ground.

Step 2: Simplify 

The velocity of car relative to the ground. so this car is relative to the is in opposite direction. So the velocity of car that relative to the ground is calculated by

car's velocity is that is relative to the ground. we need to find the expression for and both cars are at the rest, if using the conversation law of momentum,

Using expression of into equation (1) to get by

Putting the values for in equation (2) to get

The opposite direction to is meantto be negative sign.

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