A3kg box is pulled along the floor with a force of p=20 n at an angle of 30 degrees. if the box is moving at a constant velocity, calculate the force of friction f, the normal force n and the weight w.

If force is applied at 30 degree with the horizontal

then first we will find the components of force in two directions

now we can find normal force by balancing the forces in Y direction

now since block is moving with constant speed

so here forces along horizontal plane will be balanced also

Now the weight of the box is defined as

now plug in all values

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

i already answered it by 34/s