A sled (with skis on snow) is being pulled by a child with a rope. The child is being pulled with 50 N of force, and the rope makes an angle of 30 degrees with the horizontal. The sled is moving at a constant velocity of 1 m/s. What is the force of friction between the sled and ground?
What is the normal force experienced by the sled?
How much does the sled weigh?

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

the closer the planet is to the sun, the larger the gravity