A car and a truck have the same kinetic energies at a certain instant while they are moving along two parallel roads . (Assume that the truck is heavier than the car). Which one will have greater momentum?

A car and a truck have the same kinetic energies at a certain instant while they are moving along two parallel roads . (Assume that the truck is heavier than the car). If the mass of the truck is 100 times greater than that of the car ,find the ratio between their velocities.

"A heavy and light body have same kinetic energy." Which one has greater momentum? Why?

A proton and an electron have same kinetic en ergy Which one has greater value of de Broglie wavelength and why?