A student pulls a 50-newton sled with a force having a magnitude of 15 newtons. What is the magnitude of the force that the sled exerts on the student?

Force = 35 N

Explanation:

From Newton's third law of motion, the boy must apply a force greater than the weight of the sled to lift it.

weight of sled = mg

where m is its mass and g the force of gravity on it.

weight of sled = 50 N

Force applied by the boy on the sled = 15 N

Since the force applied on the sled by the boy is lesser than the weight of the sled, then;

Force that the sled exerts on the student = 50 - 15

                                             = 35 N

The force exerted by the sled on the student is 35 N.

frequency or wavelenth of em radiation in a vacuum

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000