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In a vacuum (ie in the absence of air resistance) all things fall with exactly the same acceleration. The reason for this can be easily seen.

An object, with mass ‘m’, falling in a gravitational fi...

The Doppler effect describes the changes in a wave's frequency (or wavelength) as the source of the wave moves towards/ away from the observer (you). You have almost definitely experienced this phenomenon...

First it's important to remember that a wave isn't an object that is moving. When a wave moves through a substance the particles of the substance move side to side or backwards and forwards around their o...

6.1kN vertically up

2.2kN horizontally to the right

A vector is any physical quantity which has a direction and a magnitude, whereas a scalar is a physical quantity that is not directional (magnitude only).