Aman has a power of 90 w and mass 60 kg runs up a staircase in 40 s. if each staircase is 20cm high find the number of steps? (physics grade 9- gravitation)

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

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.