As shown in the picture above, a sled of mass 67 kilograms is pulled horizontally to the right by a rope which exerts 800 N of force. As a
result, the sled moves at a constant velocity. The coefficient of kinetic
friction between the sled and the ground is (round to nearest hundredth
(2nd decimal place i. e. 0.18).

With i really need the correct answer!

What is the magnitude of the resultant vector round your answer to the nearest tenth

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)