In an isolated system, two cars, each with a mass of 1,000 kg, collide. car 1 is
initially at rest, while car 2 was moving at 10 m/s. they move off together.
what is their speed?
a. o m/s
b. 20 m/s
c. 5 m/s
d. 10 m/s

Their speed is 5 m/s.

c. 5 m/s

Explanation:

The situation described in the given problem is an example of inelastic collision where the objects stick together and the kinetic energy won’t be conserved. Some of the kinetic energy might transform to thermal energy or some other form of energy.

Here the mass of first vehicle

mass of second vehicle

velocity of the first vehicle

velocity of the second vehicle

Since the masses of the vehicles are combined after the collision their velocities also will be combines.

Therefore mass of the system after collision =

velocity of the system after collision = v

According to the law of conservation of momentum

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

links? do you have a link? i don't see anything?