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प्रश्न
When is the acceleration due to gravity positive?
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उत्तर
If a body falls towards the earth, then value of acceleration due to gravity is positive.
संबंधित प्रश्न
A toy car initially moving with uniform velocity of 18 km h-1 comes to a stop in 2 s. Find the retardation of the car in S.I. units.
A space craft flying in a straight course with velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km s-1 in the same direction.
Find
(i) The space craft's average acceleration while the motors were firing
(ii) The distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors being in action for only 6 s.
From the diagram given below, calculate acceleration.
Negative acceleration is called ______.
Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.
Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.
When an object undergoes acceleration ______.
If a body starts from rest, what can be said about the acceleration of the body?
Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.
When a body is said to be in
- uniform acceleration
- non–uniform acceleration?
