Question

A car starts from rest. if the velocity of car become 15m/s after 20s calculate the acceleration of the car.​

Answer 1

`\Large\rm{\underbrace{\green{ \: Acceleration \: = \: \ (v)/(t) \: }}}`

• V denotes rate of change in Velocity

• t denotes time taken

`\bf \large \implies \: Acceleration \: = \: (15)/(20) \\`

`\bf \large \implies \: Acceleration \: = \: \cancel(15 \: \small \: m /s )/(20 \: s) \: = \: (3)/(4) \: m /s ^( - 1) \\`

`\bf \large \implies \: Acceleration \: = \: \cancel(3)/(4) \:m /s ^( - 1) \: = \: 0.75 \: \: m /s ^( - 1) \\`

`\bf \large \implies \: \: Acceleration \: = \: 0.75 \: \: m /s ^( - 1) \\`

Answer 2

`0.75 {ms}^( - 2)`

Explanation:

`acceleration = (velocity)/(time) \\ = (15ms ^( - 1) )/(20s) \\ = (3)/(4) ms ^( - 2) \\ = 0.75 {ms}^( - 2)`