A child with a mass of 40Kg is standing on a scale in an elevator. The elevator is accelerating up at 2 m/s2
.
a) Draw a free body diagram of the situation:
b) Calculate the reading on the scale.

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

What is the measurement of how fast an object moves relative to a reference point?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up