Aspaceship moving through deep space will continue moving at the same speed forever. what is the name of the property that allows this to happen? a. force b. normal force c. mass d. inertia

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.