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Force and Laws of Motion Additional Exercises Solutions
- QA1(a): The following is the distance-time table of an object in motion: (a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?
- QA1(b): The following is the distance-time table of an object in motion: (b) What do you infer about the forces acting on the object?
- QA2: Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2 $m s^{-2}$. With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort.)
- QA3: A hammer of mass 500 g, moving at 50 $m s^{-1}$, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?
- QA4: A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. Its velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.
Other Exercises for CBSE - Class 9 Science Force and Laws of Motion
Chapters in CBSE - Class 9 Science
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