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Motion in Straight Line
Question
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The velocity-time graph of particle moving in straight line is given below. Three equal intervals t1 = t2 = t3 are shown. In which interval acceleration is constant, zero and variable? What is the acceleration at A and C? 

Answer

Acceleration is constant in interval t2, it is zero in the interval t3 and variable in the interval t1.
At point A, the velocity is maximum. So, acceleration is zero. 
The slope of v-t graph is zero at point C. Hence, acceleration is zero here. 

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Some More Questions From Motion in Straight Line Chapter

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(d) Accelerated motion of a particle in a straight line.

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