Driving home from school one day, you spot a ball rolling out into the street (s

Question

Driving home from school one day, you spot a ball rolling out into the street (see the figure (Figure 1) ). You brake for 1.50s , slowing your 910-kg car from 16.0 m/s to 9.50 m/s.

Part A

What was the magnitude of the average force exerted on your car during braking?

Express your answer using two significant figures.

Part B

What was the direction of the average force exerted on your car during braking?

Part C

How far did you travel while braking?

Driving home from school one day, you spot a ball rolling out into the street (see the figure (Figure 1) ). You brake for 1.50s , slowing your 910-kg car from 16.0 m/s to 9.50 m/s. Part A What was the magnitude of the average force exerted on your car during braking? Express your answer using two significant figures. Part B What was the direction of the average force exerted on your car during braking? Part C How far did you travel while braking?

Explanation / Answer

the average force =rate of change of momentum
a) f=910*(9.50-16)/{1.50}

= -3943.33

C ) f=m*a
a=f/m

=-3943.33/910=-4.33

s=16*1.50+1/2*a*(1.50^2)

=16*1.50+1/2*4.33*(1.50^2)

= 28.87125

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