A car is running at a uniform rate of 40km/h. The driver applies brakes and stops the car within 10m. What is the nature of work done by force of brakes?
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Answer:
Acceleration, a=
Time
v
final
−v
initial
Therefore, −2m/s
2
=
5s
v
final
−20m/s
v
final
=10m/s
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