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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
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.
A bullet initially moving with a velocity 20 m/s strikes a target and comes to rest after penetrating a distance 10 cm into the target. Calculate the retardation caused by the target.
A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km/h. After 2 s, it is 33.6 km/h, and after further 2 s, it is 37.2 km/h. Find the acceleration of the vehicle in m s-2. Is the acceleration uniform?
The change in velocity of a motorbike is 54 kmh−1 in one minute. Calculate its acceleration in (a) ms−2 (b) kmh−2.
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.
A motorbike, initially at rest, picks up a velocity of 72 kmh−1 over a distance of 40 m. Calculate
- acceleration
- time in which it picks up above velocity.
A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?
Write the SI unit of acceleration and retardation.
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
