Which of the following statements about black holes is false. a. astronomers have never seen a black hole. b. a black hole sucks in matter like a vacuum cleaner. c. no light can escape from a black hole. d. all of the mass in a black hole is concentrated in a single point.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?