Question

If a particle is displaced a distance s, the work done by the force is W = Fs And if the particle has a mass m and moves with a velocity v, its kinetic energy is K = 1/2 m v^2. According to work energy theorem, W = Kf - Ki , where Kf is the final kinetic energy and Ki is the initial kinetic energy. In case, a body is moving on a horizontal surface, the weight mg of the body is balanced by the normal reaction (R). Neither of these forces (R and mg) do work since displacement is horizontal. In case the surface is rough, frictional force (f) is also taken into account where f= μR = μmg. A 6.0 kg block initially at rest is pulled to the right along a horizontal frictionless surface by a constant force of 12 N and moves a distance of 3.0 m. With the help of the comprehension given above, choose the most appropriate alternative to the following questions.
3333, Work done by the force is. Single choice.
(1 Point)
zero
36 J
18 J
180 J
3434, The velocity of the block after covering 3 m distance. Single choice.
(1 Point)
12 m/s
6 m/s
3.5 m/s
3 m/s
3535, In case the surface is rough (μ = 0.15), the net force acting on the block is. Single choice.
(1 Point)
20.82 N
3.18 N
31.8 N
28 N
3636, The change in kinetic energy of the block in the above case is. Single choice.
(1 Point)
36 J
30 J
9.54 J
18 J

Answer 1

Answer:

sorry I don't understand your question