# What is the formula to find relative velocity of two bodies A and B?

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## What is the formula to find relative velocity of two bodies A and B?

Case 4: Two bodies moving in the opposite direction. Also, if A and B are moving with same velocity V in the opposite direction ( i.e., VA = VB = V), then the relative velocity of A with respect to B is given by, v – (-V) = 2V = – relative velocity of B with respect to A.

**How do you find relative velocity with respect to B?**

The relative velocity of A with respect to B= velocity of the body A – velocity of the body B.

**How do you calculate the relative speed of two objects moving in the opposite direction?**

When two bodies move in opposite direction, then the Relative Speed = Sum of Speeds i.e for e.g. for a person sitting in a train moving with a Speed of 40 km/hr in the west direction, another train which is going towards east with a Speed of 40 km/hr, will appear to move at a Speed of (40+40) = 80 km/hr.

### What is relative velocity of a body?

Definition of relative velocity : the vector difference between the velocities of two bodies : the velocity of a body with respect to another regarded as being at rest — compare relative motion.

**What is velocity of ground with respect to B?**

Hence, velocity of ground w.r.t train B is 90 km/h towards north.

**What does a relative to B mean?**

The velocity of an object A relative to another object B is the velocity that object A would appear to have to an observer moving with B. To you, sitting on the stationary train (A), or to a person on the platform, the moving train (B) appears to be travelling at a velocity v away.

#### What is relative speed ks3?

Relative speed. Objects moving in the same direction towards, or away from, each other. Fastest speed – slowest speed. Objects moving in opposite directions towards, or away from, each other. Add the two speeds together.

**How do you calculate relative distance?**

For example, if two persons are moving at 10 km/h and 20 km/h in opposite directions, then their relative speed would be 10 + 20 = 30 km / h, i.e., the distance between them after one hour would be 30 km.

**What is the relative velocity for the bodies moving in the opposite direction?**

The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies .

## What is the initial velocity of a 2 kg body?

A body of mass 2 kg has an initial velocity of 3 m/s along OE and it is subjected to a force of 4 Newton’s in of direction perpendicular to OE. What will the distance of the body from O after 4 seconds be? A body of mass 2 kg has an initial velocity of 3 m/s along OE and it is subjected to a force of 4 Newton’s in of direction perpendicular to OE.

**How do you find the relative velocity with respect to B?**

V A B → = 3 2 + 4 2 = 5 km/s at angle of 36.9 0 North of West. To do relative velocity questions you have to make one of the bodies stationary. The question says ‘with respect to B’ – that means you have to make B stationary. WE do this by subtracting the veloicity of B from B (we get the answeer zero of course).

**What is the constant velocity of the body in the equation?**

In the equation, x 0 is the displacement at time t, v is the constant velocity of the body . The SI unit of velocity is m/s (m⋅s−1). Other units and dimensions of velocity are given in the table below.

### How do you calculate relative speed of two bodies?

Relative Speed of 2 bodies = Sum of their individual speeds if they are moving in the opposite direction = Difference of their individual speeds if they are moving in the same direction. Consider A and B starting at the same time, travelling in the opposite direction with a speed of 20 kmph and 30 kmph and they have to travel a distance of 200 km.