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प्रश्न
When is the acceleration due to gravity positive?
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उत्तर
If a body falls towards the earth, then value of acceleration due to gravity is positive.
संबंधित प्रश्न
Define acceleration. State its unit.
Give one example of the following motion:
Uniform retardation
Figure shows the velocity-time graphs for two cars A and B moving in the same direction. Which car has greater acceleration? Give reasons to your answer.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity and variable acceleration.
A racing car, initially at rest, picks up a velocity of 180 kmh−1 in 4.5 s. Calculate
- acceleration
- distance covered by the car.
Is it possible for an accelerating body to have constant speed?
What do you understand about negative acceleration?
A bus accelerating with 4ms-2 changes its speed from 60ms_1 to a certain value in 5s. The final speed is ______.
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.
