M An astronaut on a planet with no atmosphere is conducting gravity experiments. He throws a large rock
upward with an initial speed of 2.0 and catches it after 4.0 s. The magnitude of the gravitational force
of the rock is 8.0 N.
S
What is the best estimate of the mass of the rock?

Which governments provide garbage collection services to homes and businesses

When using the scientist method, which step comes last?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?