# Answer on Mechanics | Relativity Question for Vanessa

Question #5425

The driver of the compact car in the previous problem suddenly applies the brakes hard for 2.0 s. As a result, an average force of 5.0x10^3 N is exerted on the car to slow it down. The previous problem has a car that weighs 725 kg that is moving at 115 km/h that has a momentum of 2.32x10^4 kgm/s eastward. Also has another car that weighs 2175 kg with a velocity of 38.4 km/h. What is the change in momentum; that is, the magnitude and direction of the impulse, on the car? Complete the "before" and "after" sketches, and determine the momentum and the velocity of the now.

Expert's answer

The driver of the compact car in the previous problem suddenly applies

the brakes hard for 2.0 s. As a result, an average force of 5.0x10^3 N

is exerted on the car to slow it down. The previous problem has a car

that weighs 725 kg that is moving at 115 km/h that has a momentum of

2.32x10^4 kgm/s eastward. Also has another car that weighs 2175 kg with a

velocity of 38.4 km/h. What is the change in momentum; that is, the

magnitude and direction of the impulse, on the car?

<img style="width: 625px; height: 524px;" src="../../..//assignments/uploaded_files/static/91/b2/91b2f8748f2878eae3e17c012a5d3c10.png" title="" alt="">

the brakes hard for 2.0 s. As a result, an average force of 5.0x10^3 N

is exerted on the car to slow it down. The previous problem has a car

that weighs 725 kg that is moving at 115 km/h that has a momentum of

2.32x10^4 kgm/s eastward. Also has another car that weighs 2175 kg with a

velocity of 38.4 km/h. What is the change in momentum; that is, the

magnitude and direction of the impulse, on the car?

<img style="width: 625px; height: 524px;" src="../../..//assignments/uploaded_files/static/91/b2/91b2f8748f2878eae3e17c012a5d3c10.png" title="" alt="">

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