Lorry of mass 4000 kg is travelling at a speed of 4.0 m/ s.
A car has a mass of 1000 kg. The kinetic energy of the car is equal to the kinetic energy of the lorry.
What is the speed of the car?

speed of the car = 8 m/sec

Explanation:

For Lorry

Mass of the lorry m = 4000 kg

Speed of the lorry v= 4 m/sec

Kinetic energy of the lorry = = =32000 J

It is given that Kinetic energy of car = Kinetic energy of lorry

Hence, Kinetic Energy of car = 32000 J

For car

Mass of the car = 1000 kg

Suppose the speed of the car =

Kinetic energy of the car = =32000 J

=32000

m/sec

Hence speed of the car = 8 m/sec

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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