Applied Mechanics and Graphic Statics
A rigid body is in a stable equilibrium if the application of any force

None of above
Can raise the CG of the body but cannot lower it
Neither raises nor lowers the CG of the body
Tends to lower the CG of the body

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Applied Mechanics and Graphic Statics
‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₁ - v₂/u₂ + u₁
e = u₂ - u₁/v₁ - v₂
e = v₁ - v₂/u₂ - u₁
e = v₂ - v₁/u₁ - u₂

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