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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 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.
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Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car Q between 2 s – 5 s.
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Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.
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Assertion: When a body is subjected to a uniform acceleration, it is always moving in a straight line.
Reason: Motion may be straight-line motion or circular motion.
