A 50,000-kg train car moving at 2 m/s collides and connects to another identical car initially at rest. Show all calculations.

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?