21. In ideal machines, mechanical advantage is __________ velocity ratio.
22. Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.
23. The amplitude is always __________ radius of the circle.
24. The bodies which rebound after impact are called
25. The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.
26. Work done is said to be zero, when
27. The friction experienced by a body, when in motion, is known as
28. The acceleration of a body sliding down an inclined surface is
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