please help me with this Physics problem. I don't get it.?

Posted on 2014-11-20 06:47:00 in Physics by LUIS

A force F which varies with time t is shown in the graph above, where F0 = 90 N and T = 0.25 seconds. This force is applied to an object of mass 3 kg which is initially at rest.

(a) What is the acceleration of the object at time t = T?

(b) What is the speed of the object at time t = T?

(c) What is the speed of the object at time t = 2T?

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