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प्रश्न
When is the acceleration due to gravity negative?
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उत्तर
If the body rises vertically upwards, then the value of acceleration due to gravity is negative.
संबंधित प्रश्न
The velocity-time graph for a uniformly retarded body is a straight line inclined to the time axis with an obtuse angle. How is retardation calculated from the velocity-time graph?
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
- The maximum velocity reached,
- The retardation in the last 50 s,
- The total distance travelled,
- The average velocity of the train.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
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.
Correct your friend who says that acceleration gives the idea of how fast the position changes.
What do you mean by constant acceleration?
The speed of a particle is constant. Will it have acceleration? Justify with an example.
What is meant by negative acceleration?
It is possible to have objects moving with uniform speed but variable acceleration.
When a body is said to be in
- uniform acceleration
- non–uniform acceleration?
