B 120 kg
1
20 m
m
A roller derby car with a mass of 120kg starts at the top
of the hill (20 meters high) how fast is the car going at
point B with a height of 16 meters? (use g = 10m/s/s
and create a LOL to help solve the problem)

What happens to the light rays when they hit the specimen?

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .