Question

what is acceleration??????​

Answer 1

Answer:

Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. ... Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.

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Answer 2

Answer:

The rate of change of velocity of a moving body is called acceleration

Explanation:

The acceleration of a ball moving down in the inclined plane and the bicycle in the

slanting road increases gradually. Similarly, the velocity of any object falling from

certain height towards the earth surface also gradually increases. Thus, the rate of

change of velocity of a moving body is called acceleration. The unit of acceleration

is metre per square second (m/s2

).

Mathematically,

Acceleration (a) =

Change in velocity (m/s)

Time taken(s)

= Final velocity (v) - Initial velocity (u)

Time taken(t)

Example 3.

The velocity of a car increases from 10m/s to 30m/s in 10 second. Find the acceleration

of the car.

Solution:

Here, Total time taken = 10s

Initial velocity (u) = 10m/s

Final velocity (v) = 30m/s

Change in velocity = v - u = 30m/s - 10m/s

= 20m/s

20 Science and Environment, Grade - 7

Now,

Acceleration (a) = Change in velocity

Time taken

=

20m/s

10s

= 2m/s2

∴ The acceleration of the car is 2m/s2

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