Question

• Acceleration -time graph for a particle starting from rest at t=0 is given below. the particle has speed at​

Answer 1

Answer:

max speed it as 0 seconds

because at half time the speed is decreased

Answer 2

Answer:

Acceleration is + ve till it becomes zero.

Explanation:

From the graph you can see that acceleration is decreasing but it is always positive and hence its direction is same throughout from t=0 to t=11 and velocity will keep on increasing and will be in the direction of acceleration. hence magnitude of velocity can be taken as speed. and maximum speed will be at t=11 sec

a=dv/dt

dv= adt

integrating from t=0 to t=11

change in velocity=v2-v1 area under a-t graph=1/2 x 11 x 10 =55m/s

since v1 is zero then v2=55 m/s

Acceleration is + ve till it becomes zero.

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