Question

explain clearly uniform acceleration variable acceleration average acceleration and instantaneous acceleration​

Answer 1

ANSWER:-

A body is said to be moving h uniform acceleration if its velocity changes by equal amounts in equal intervals of time, however small these intervals may be. Variable Acceleration.

Answer 2

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Acceleration is the rate of change of velocity with time.

→Explaination

→During uniform motion of an object along a straight line,the velocity remains constant with time.In this case ,the change in velocity of an object for any time interval is zero.

→Hence the acceleration will also be 0.

However,in non-uniform motion,velocity varies with time.It has different values at different instats and at different points of the path.Thus , the change in velocity of the object during any time interval is not zero.

→Hence acceleration will not be equal to 0.

→acceleration=change in velocity/time

a=(v-u)/t

SI unit of acceleration=m/s²

when the velocity of a body increases with time then it is said to be positive acceleration

when the velocity of a body decreases with time then it is said to be negative acceleration

Extra info

three equations related to uniform acceleration

v=u+at

s=ut+1/2at²

v²=u²+2as