**Solution - **The force needed is to be calculated by using the relation :

Force = mass * acceleration ** F = m * a**

Force, F = ? ( To be calculated) Mass, m = 6 Kg

Acceleration, a = 4 m/s^{2 }

Now putting the value in above equation, we get

F = 6 * 4

Force, F = 24 N , Thus the force needed is of** 24 newtons.**