A400 kg object is sitting at rest at the top of a hill that is 30.0m high and 80.0m long measured along the hill . if there is no friction ,how fast will the object be going at the bottom of the hill?

Iwill give brainliest if you answer right : )

Which situation will produce the greatest change of momentum

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.