physics

A bus moves from rest with a uniform acceleration of 2m/s(square) for the first 10s. It then accelerate at a uniform rate of 1m/s(square) for another 15s, it continues at constant speed for 70s and finally comes to rest in 20s by uniform deceleration.Draw the velocity time graph using the information above.
Please I need an instant answer.

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  1. v(0)=0
    v(10)=1/2 a t^2=1/2 *2*100=100m/s
    so draw a straight line from 0,0 to 10,100
    v(15)=100+1/2 a (t-10)^2 =100+ 1/2 (1)(25=125m/s
    so plot the point (15,125)
    then keep speed a constant horizontal line until time=70+15
    plot the point (105, 125)
    finally velocity at time125, v=0. Plot that point.

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    bobpursley
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