Acar is traveling at 20 meters/second and is brought to rest by applying brakes over a period of 4 seconds. what is its average acceleration over this time interval?

How would doubling the made of an object change the objects potential energy

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?