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Question
When is the acceleration due to gravity negative?
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Solution
If the body rises vertically upwards, then the value of acceleration due to gravity is negative.
RELATED QUESTIONS
A train starts from rest and accelerates uniformly at a rate of 2 m s−2 for 10 s. It then maintains a constant speed for 200 s. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 s. Find
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- The retardation in the last 50 s,
- The total distance travelled,
- The average velocity of the train.
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Write the SI unit of retardation.
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Work out: Deceleration
A car accelerates to a velocity of 30 m/s in 10 s and then decelerates for 20 s so that it stops. Draw a velocity-time graph to represent the motion and find:
The acceleration.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
When an object undergoes acceleration ______.
