Rate of Change of Momentum:
The rate of change of momentum of a body is given by the formula:

Force = Rate of Change of Momentum / Time

The given problem states that the rate of change of momentum of the body is 5 kgms. To find the force acting on the body, we need to know the time duration during which this change occurred. Unfortunately, the time is not provided in the problem statement. Therefore, it is not possible to determine the force without knowing the duration.

However, I can still explain the concept of rate of change of momentum and how it relates to force.

Definition:
The rate of change of momentum is a measure of how quickly the momentum of an object is changing. Momentum is defined as the product of an object's mass and velocity.

Formula:
The rate of change of momentum (Δp) is calculated by subtracting the initial momentum (p₁) from the final momentum (p₂) and dividing it by the time interval (Δt):

Δp = p₂ - p₁ / Δt

Explanation:
When a force acts on an object, it causes a change in its momentum. The greater the force, the faster the momentum changes. This relationship is described by Newton's second law of motion, which states that the force acting on an object is equal to the rate of change of its momentum.

Conclusion:
In conclusion, without knowing the time interval during which the change in momentum occurred, it is not possible to determine the force acting on the body. The force can be calculated by dividing the rate of change of momentum by the time interval.