Question

The linear speed of the tip of second arm of a clock is
v. The magnitude of change in its
velocity in 30 second is ......

(A)2
v (B)
v/√2
(C)
√2
v (D)zero​

Answer 1

Given :

▪ The linear speed of the tip of second arm of a clock is v$.$

To Find :

➳ The magnitude of change in it's velocity in 30s$.$

SoluTion :

➝ Velocity is a vector quantity having both magnitude as well as direction.

Let's assume that, velocity of the tip of second arm

• At number 12 be v
• At number 6 be -v

➝ Negative sign shows opposite direction.

Magnitude of change in velocity :

⟶ Δv = final velocity - initial velocity

⟶ Δv = (-v) - v

⟶ Δv = -2v

⟶ |Δv| = 2v ☃