A car and driver weighing 7130 N passes a sign stating ... ?

"Bridge Out 32 m Ahead." She slams on the brakes, and the car decelerates at a constant rate of 13.8 m/s^2. The acceleration of gravity is 9.8 m/s^2.

What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water?

Question

Physics

Monique Knapp

14 October, 00:42

A car and driver weighing 7130 N passes a sign stating ... ?

"Bridge Out 32 m Ahead." She slams on the brakes, and the car decelerates at a constant rate of 13.8 m/s^2. The acceleration of gravity is 9.8 m/s^2.

What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water?

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Answers (1)

Know the Answer?

Terrance Nixon · Answer 1

321 280 J

Explanation:

Work done = force * distance

The distance is 32 m

The force can be calculated using the second law of motion

F = ma = (7130 N : 9.8 m/s²) * 13.8 m/s² = 10 040 N

Work done = force * distance

= 10 040 N * 32 m

= 321 280 J