# Homework Help: Help with motion question?

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1. Jun 23, 2015

### Deep Dhillon

1. The problem statement, all variables and given/known data

A cops and robbers chase is set up as follows

1. Both the police car and the robber's can start from rest
2. The robbers have 1 km head start
3. The robber's van accelerate at 0.50 m/s
4. The police car accelerate at 0.60 m/s

Use famous 5 equations to answer the following
A. When will the speed of the cop car and the robber van be the same
B. When will the cops catch the robbers ?

2. Jun 23, 2015

### dean barry

You know that when they meet, the distance covered by the robber = the distance covered by the cops + 1000 metres, and the time at this point is equal for both.
You could say that :
( Based on the classic equation : s = ( u * t ) + ( ½ * a * t² ) )
½ * 0.6 * t² = ( ½ * 0.5 * t² ) + 1000

3. Jun 23, 2015

### haruspex

Dean, yet again you give too much help in one go. It would have been fine without that last line. Please stop doing this.