Tony is driving a truck of mass 2.00 × 103 kilograms to the west with a velocity of 14.0 meters/second. he collides with a car of mass 1.20 × 103 kilograms moving to the south with velocity 21.0 meters/second. after the collision, they move together. find the velocity with which they move together

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?

Why do atoms emit energy of only specific wavelengths

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.