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प्रश्न
When is the acceleration due to gravity positive?
उत्तर
If a body falls towards the earth, then value of acceleration due to gravity is positive.
संबंधित प्रश्न
A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m s-1 to 20 m s-1 in 3 s. What is its acceleration?
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 racing car, initially at rest, picks up a velocity of 180 kmh−1 in 4.5 s. Calculate
- acceleration
- distance covered by the car.
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.
A body falls towards the earth. Does it have positive or negative acceleration?
Interpret the following graph:
A car is moving with a speed of 50 km/h. One second later, its speed is 55 km/h. What is its acceleration?
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Deceleration
What is the difference between uniform acceleration and non–uniform acceleration?
When a body is said to be in
- uniform acceleration
- non–uniform acceleration?
