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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
Distinguish between acceleration and retardation.
Define the term acceleration due to gravity. State its average value.
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?
Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.
(a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason .
(b) Compare the magnitude of acceleration and 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.
What is the SI unit of acceleration?
What does a positive acceleration mean?
A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?
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:
Distance travelled
What is meant by negative acceleration?
