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# A dynamics question in need of checking?

A toy rocket of mass 0.2kg is projected vertically upwards from rest by means of force which decreases uniformly in 2 seconds from 2kg wt to zero and thereafter ceases. Find the maximum height reached.

If it helps, a = (9-5t)g from 0<t<2 and a = -g from t>0 (t = seconds).

The answer is 130g/3 metres but I can't get this answer.

Any help is appreciated. THanks.

### 1 Answer

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- Anonymous1 decade agoFavorite Answer
Yes, the 130g/3 m is correct. You have to work from first principles.

Got the method from the link below:

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