Question

Which of the following is the correct expression for the coefficient of restitution?

(a) Relative speed of separation + Relative speed of approach

(b) Relative speed of separation - Relative speed of approach

(c) Relative speed of separation × Relative speed of approach

(d) Relative speed of separation ÷ Relative speed of approach​

Answer 1

Explanation:

Coefficient of restitution is defined as the ratio of relative velocity after collision to the relative velocity before collision. If u

1

& u

2

are the velocities of 2 bodies before collision & v

1

& v

2

are velocities after collision then coefficient of restitution,

e=

u

1

−u

2

v

1

−v

2

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Answer 2

d) Relative speed of separation ÷ Relative speed of approach

coefficient of restitution = Relative speed of separation ÷ Relative speed of approach

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