A2kg mass is moving on a frictionless airtrack. it collides into a motionless 1.5 kg mass.
what is the combined speed of the two masses if they stick together on impact

Explanation:

From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum

Momentum, p=mv where m is the mass and v is the velocity

where is the common velocity, and are velocities of 2 Kg moving mass and motionless 1.5 kg mass respectively, and are masses of 2 Kg moving mass and motionless 1.5 kg mass .

Since the 1.5 Kg mass is motionless, it's velocity is zero hence

By substitution

b) returns freshwater to the earth.

c) returns freshwater to the earth.c) occurs after condensation.

d) returns freshwater to the earth.c) occurs after condensation.d) roughly equal to the amount of evaporation.

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e/c, where e is its total energy