Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together.

What is the speed of the trucks after the collision?

A

v/4

B

v/2

C

v

D

5v/4

A person lying on an air mattress in the ocean rises and falls through one complete cycle every 3.00 seconds. The crests of the wave causing the motion are 20.9 m apart. Determine the frequency of the wave.

When a guitar string is plucked and the wooden guitar vibrates at the same pitch as the string, this is called a refraction b diffraction c resonance d constructive interference

What is the name of the compound that goes with the chemical formula MgCl2

I can't figure this out, I could use an explanation too! A speeding truck travels in the positive x direction. It hits a car traveling in the positive y direction. The vehicles are deformed and travel together at an angle θ with the positive x-axis.

Octane is an important component of gasoline. Octane will ignite at a temperature of 428°F. What is this temperature on the Celsius scale?

Why do we use average force while solving momentum problems? How is net force related to the momentum of the object?

If you had a positive 8 score on the sit-an-reach test you

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large deposit of dust that contained substances only found in asteroids.

Near which location in New York State would a geologist have the greatest chance of finding dinosaur footprints in the surface bedrock?

E=mc^2 solve for c E/m m/E sqrt (E/m) sqrt (m/E) E - m sqrt (E-m)