A body of mass 60 kg is pushed up with just enough force to start it moving on a rough surface with `mu_(s) = 0.5` and `mu_(k) = 0.4` and the force continues to act afterwards. What is the acceleration of the body ?

Explanation

To solve the problem step by step, we can follow these procedures:

### Step 1: Identify the forces acting on the body
When the body is at rest and is about to start moving, the force applied must overcome the static friction. Once it starts moving, the kinetic friction will act against the applied force.

### Step 2: Calculate the normal force
The normal force (N) acting on the body is equal to its weight when it is on a horizontal surface. The weight can be calculated using the formula:
\[ N = m \cdot g \]
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