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प्रश्न
A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.
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उत्तर
Initial velocity of car = u = 50 m/s
Final velocity of car = v = 0 .......[∵ As car comes to rest]
Time = t = 20s
Acceleration = a = ?
v = u + at
0 = 50 + a(20)
−20a = 50
a = `(-50)/20` = −2.5 ms−2
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संबंधित प्रश्न
Define acceleration. State its unit.
What is meant by the term retardation? Name its S.I. unit.
If a body is moving with a constant velocity its acceleration is ______.
The acceleration of a body is 8.5 ms-2. What does this statement mean?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
The rate of change of velocity is ______.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
The acceleration of the body that moves with a uniform velocity will be ______.
It is possible to have objects moving with uniform speed but variable acceleration.
Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.
