Author Question: A 4.0 kg box of fruit slides 8.0 m down a ramp, inclined at 30. from the horizontal. If the box ... (Read 80 times)

bcretired · **on:** Jul 27, 2018

A 4.0 kg box of fruit slides 8.0 m down a ramp, inclined at 30. from the horizontal. If the box slides at a constant velocity of 5.0 m/s, the work done by gravity is

A) +78. J.
B) 0.16 kJ.
C) -78. J.
D) zero.
E) -0.16 kJ.

Question 2

Modern mammals are descendants of

A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago
B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago
C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago
D) early mammals that killed off the dinosaurs