An object of mass m=5kg is being pulled up an inclined plane which is at 40° to the horizontal. The object is pulled at a constant speed of 0.8ms-1 by a force which acts parallel to the inclined plane.
The coefficient of friction between the object and the plane is 0.2
a)Draw a diagram showing the forces acting on the object.
b)Calculate the magnitude of the force of friction acting on the object.
c)Calculate the gain in gravitational potential energy when the object has moved 0.5m (measured parallel to the slope).
d)Calculate the total work done in pulling the block 0.5m (measured along the slope).​

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)