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प्रश्न
When is the acceleration due to gravity negative?
उत्तर
If the body rises vertically upwards, then the value of acceleration due to gravity is negative.
संबंधित प्रश्न
Distinguish between acceleration and 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.
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.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
From the diagram given below, calculate 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 happens to the stepwise increasing speed-time graph when the size of each step is made very small?
Sketch the shape of the velocity-time graph for a body moving with:
Uniform acceleration.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
It is possible to have objects moving with uniform speed but variable acceleration.
