1.  $1.$Calculate the acceleration of a car, if its speed changes from 0$0$ m/$/$s $($at rest) to $30$ m/$/$s in 6 seconds. 

1.  2. A rock falls of a cliff. What is the acceleration due to gravity if the stone is travelling at 30 m$/$s after 3 seconds. 

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3.  3. A car moving at 10m$/$s,$,$ accelerates at 3m$/$s.$.$ How long will it take for the car to reach 31 m$/$s?

 

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