What force is needed to accelerate a 6 kg object at 2 m/s2?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.