Define the concept of relative acceleration.

Relative acceleration is the acceleration of one object with respect to another.

Relative acceleration is the acceleration of one object with respect to another. It is the difference between the acceleration of the two objects. For example, if two cars are travelling at different speeds and one car accelerates, the relative acceleration between the two cars is the difference in their accelerations.

To calculate relative acceleration, we first need to calculate the acceleration of each object. This can be done using the formula a = (v-u)/t, where a is acceleration, v is final velocity, u is initial velocity, and t is time. Once we have the acceleration of each object, we can find the relative acceleration by subtracting the acceleration of one object from the acceleration of the other.

For example, if car A is travelling at 20 m/s and accelerates at 5 m/s^2, and car B is travelling at 30 m/s and accelerates at 3 m/s^2, the relative acceleration of car A with respect to car B is:

a(A/B) = a(A) - a(B)
a(A/B) = 5 - 3
a(A/B) = 2 m/s^2

This means that car A is accelerating 2 m/s^2 faster than car B.

Relative acceleration is an important concept in physics and is used to understand the motion of objects in relation to each other.