Question

A 20N force pushes a 5kg block for 10m on a horizontal surface. The coefficient of friction between the block and the surface is 0.3. What is the increase in kinetic energy of the block?

Answer 1

The increase in kinetic energy of the block is 200 J (joules).

Step-by-step explanation:

The increase in kinetic energy of the block can be calculated using the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy. The work done by the 20N force is given by the formula: work = force * distance * cos(angle). In this case, the angle is 0 degrees since the force is applied horizontally. So, the work done is: work = 20N * 10m * cos(0). The coefficient of friction is not needed in this calculation since there is no friction involved. Therefore, the increase in kinetic energy is equal to the work done, which is 200 J (joules).