An object moving forward at 10 m/s suddenly begins moving backward at 5 m/s. what is the most accurate explanation for this change?

a. the forces pushing the object forward became greater than the ones pushing the object back causing it to change direction.

b. the force pushing back on the object became greater than the force pushing the object forward.

c. the object was traveling in a straight line until it hit a brick wall and bounced backward.

d. the forces were ubalanced in the forward direction. then they became balanced in the backward direction.

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.