Imagine you wanted to work out the speed of a car and the only way you could do it was by throwing a basket ball at it and measuring where the basketball bounced to after impact.
This is fine for cars because basketballs are comparatively light and so don’t affect the car at all.
However if you wanted to measure the speed of a ping pong ball after Co tact the ping pong ball is going to be going at a new speed and direction because of the impact of the basketball
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