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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.
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
What is meant by the term retardation? Name its S.I. unit.
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Draw velocity – time graph for the following situation:
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Distinguish between uniformly and non-uniformly accelerated motions.
Is it possible for an accelerating body to have constant speed?
A body has an acceleration of -3.5 ms-2. What is its retardation?
Sketch the shape of the velocity-time graph for a body moving with:
Uniform acceleration.
State whether true or false. If false, correct the statement.
Acceleration can get negative value also.
A quantity has a value of 16ms-2. It is the ______.
When a body is said to be in
- uniform acceleration
- non–uniform acceleration?
