Question

A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds. What is the acceleration of this helicopter? m/s2

Answer 1

A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds.

What is the acceleration of this helicopter?

2

m/s2

Step-by-step explanation:

Correct on egde

Answer 2

The acceleration of this helicopter is
`2 m/s2`

Step-by-step explanation:

In this question the velocity changes from 30 m/sto 40 m/s in 5 seconds.

Initial velocity u=
`30m/s`

Final velocity u=
`40m/s`

Time t=
`5s`

Acceleration is defined as the rate of change of velocity. It is given by the equation

`a= (v-u)/(t)`

=
`(40-30)/(5)`

=
`(10)/(5)`

=
`2 m/s2`

All moving bodies aren’t necessarily accelerated. To be identified as accelerating, a body should have its velocity changing. Thus a body in uniform motion is not accelerating since its velocity is constant.