Which statement describes the difference between speed and velocity
a. velocity is speed with a direction. b.velocity is speed divided by time. c.velocity is speed multiplied by time. d.velocity is measured in meters per second while speed is measured in meters.

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory