Question

a. Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.

2. b. Solve the problem attached​

Answer 1

Answer:

Acceleration is defined as the rate of change in velocity. For motion along a straight line, if the velocity of the body is increasing with time, then it is said to be in positive acceleration. While, if the velocity of the body is decreasing with time, then it is said to be in negative acceleration or retardation.

Answer 2

part ( a ) Acceleration is defined as the rate of change in velocity. For motion along a straight line, if the velocity of the body is increasing with time, then it is said to be in positive acceleration. While, if the velocity of the body is decreasing with time, then it is said to be in negative acceleration or retardation.

A body has uniform acceleration if it travels in a straight line and its velocity increases by equal amounts in equal intervals of time. For example, a freely falling body has uniform acceleration.

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