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प्रश्न
Negative acceleration is called ______.
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उत्तर
Negative acceleration is called retardation (or) deceleration.
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संबंधित प्रश्न
Define acceleration. State its unit.
A train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the retardation.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity and variable acceleration.
A motor bike running at 90 kmh−1 is slowed down to 18 kmh−1 in 2.5 s. Calculate
- acceleration
- distance covered during slow down.
What does a positive acceleration mean?
Convert the following acceleration:
7200 km/h2 into m/s2
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Acceleration.
Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.
Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
Assertion: A negative acceleration of a body can be associated with speeding up of the body.
Reason: Increase in the speed of a moving body is independent of its direction of motion.
