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

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015