Question
Asked Feb 1, 2020
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(a) Calculate the force needed to bring a 950 kg car to rest from a speed of 90.0 km/h in a distance of 110 m (a fairly typical distance for a nonpanic stop).
 
(b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car.

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Expert Answer

Step 1

Given:

Mass of the car = 950 kg

Initial velocity of the car = 90 km/h

Final velocity of the car = 0

Distance travelled in part (a) = 110 m

Distance travelled in part (b) = 2 m

Step 2

Part (a): deacceleration of the car can be calculated as

 

Physics homework question answer, step 2, image 1
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Step 3

Force exerted on the car ca...

Physics homework question answer, step 3, image 1
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