The distplcement time graph of a prticle moving alon a staraingt line is drawn below

The acceleration of the paritcle during the regions OP, PQ and QR are

Options

A. `{:(OP,PQ,QR),(-,0,+):}`
B. `{:(OP,PQ,QR),(+,0,+):}`
C. `{:(OP,PQ,QR),(+,0,-):}`
D. `{:(OP,PQ,QR),(-,0,-):}`

Answer

C

Explanation

Acceleration = `(d^(2)x)/(dt^(2))`
For part OP , the acceleration is positive as the velocity is increasing . Slope is increasing . For part PQ , the acceleration is zero . Horizontal straight line shows that the velocity is zero . For part QR , acceleration is negative . It is retarded motion . Velocity is decreasing as the slope decreases with time . Hence option (c) is correct .