Question

a) When a body is said to be in motion?
b) When a body is said to be at rest?
c) What is negative acceleration?
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А A​

Answer 1

Answer:

1. A body is said to be in motion when its position continuously changes with respect to time.
2. A body is said to be in a state of rest when it does not moves or equivalently it's position does not change with time.
3. When an object is at rest or in uniform motion, the velocity of the object remains the same. The change in velocity of the object is zero. ... If the velocity of the object decreases then the object is said to have a negative acceleration and the meaning of retardation is decreased.