True/false/greater than/less than/equal to A car travels a certain distance alon

Question

True/false/greater than/less than/equal to

A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. When the Car changes speed it does so uniformly. Select the appropriate choice for each statement. The speed at 10 sec is.... the speed at 79 sec The x-acceleration is .... zero at 15 sec. The speed is... zero at 20 sec. The x-acceleration is zero at 4 sec At 46 sec, the speed is as high as it gets. The acceleration magnitude at 15 sec is... the acceleration magnitude at 38 sec

Explanation / Answer

1 ans

speed at 10 sec =200/10=20 sec

speed at 79 sec=1200/79=15.2 sec

so the speed at 10 sec greater than the speed at 79 sec

2 ans

the acceleration at 15 sec =300*2/15^2=2.7 m/s^2

=>false

3 ans

the speed at 20 sec=300/20=15 m/s

=>flase

4 ans

the acceleration at 4 sec=0

=>true

5 ans

=>true

6 ans

the acceleration at 15 sec=300*2/15^2=2.7m

the acceleration at 38 sec=2*320/38^2=0.44 m

=>grater than

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