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Which of the following quantities is conserved in an elastic collision of two particles?

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Important Questions on Work, Energy and Power

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 41

Find the nature of the force of interaction between two bodies colliding elastically:

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 42
Let θ denote the angular displacement of a simple pendulum oscillating in a vertical plane. If the mass of the bob is m, then the tension in the string is mgcosθ
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 43
In an inelastic collision,
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 44
The ratio of relative velocity of separation after collision to the relative velocity of approach before collision between two colliding bodies is,
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 45
In a circus, stuntman rides a motorbike in a circular track of radius R in the vertical plane. The minimum speed at highest point of track will be,
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 46
A motorcycle is going on an over bridge of radius R. The driver maintains a constant speed. As motorcycle is descending, normal force on it,
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 47
Two glass balls, two ivory balls, two cork balls, two cast iron balls, two lead balls collide.
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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 48
A sphere is suspended by a thread of length l. What minimum horizontal velocity has to be imparted to the sphere for it to reach the height of the suspension?