What are 3 characteristics of radio waves

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

Energy flows from the producer level to the level. is called