Question

4. What is relative velocity if two particles each move with a speed 10ms
a) in the same direction
b) in the opposite direction​

Answer 1

In same direction relative velocity is zero
Opposite direction 20m/s

Answer 2

Given:

Speed of A = 10 m/s

Speed of B = 10 m/s

To find:

What is relative velocity if two particles each move:

a) in the same direction

b) in the opposite direction​

Solution:

a) If two particles each move in the same direction

Va = 10 m/s

Vb = 10m/s

Vab = Va - Vb

Vab = 10 m/s - 10 m/s

Vab = 0 m/s

Therefore, the relative velocity of two particles moving in same direction is 0

b)  If two particles each move in the opposite direction

Va = 10 m/s

Vb = -10m/s

Vab = Va - Vb

Vab = 10 m/s - (-10 m/s)

Vab = 10 m/s + 10 m/s

Vab = 20 m/s

Therefore, the relative velocity of two particles moving in opposite direction is 20 m/s