Question

Revision worksheet
class 9th
periodic Test 2
subject science
1Describe the new value of acceleration due to gravity when we go at( h )distance above from the Earth surface.
2.Drive the new value of acceleration due to gravity when we go distance (d) downwards inside the earth.
3. Define
* universal law of gravitation *true fall
* mass and weight.
4. Drive the formula for acceleration due to gravity under truefall.
5. A stone is dropped from the height of 50m.
(a) calculate the speed of the stone when it hits the ground (b)calculate the time taken by the stone to fall through this height.
6. If the total time taken by the stone to come on the ground level is 10 second, find the maximum height reached by the stone.
7.If the mass of both the object is tripled and distance between them is halved calculate the new force of gravitation. plese help me ​

Answer 1

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