Question

a car start to move from the rest with an acceleration of 0.25 metre per second square find the final velocity after 3 min​

Answer 1

• Initial velocity=u=0m/s
• Acceleration=0.25m/s^2=a
• Time=t=3min=180s
• Final velocity=v

Using 1st equation of kinematics

`\\ \bull\sf\longmapsto v=u+at`

`\\ \bull\sf\longmapsto v=0+0.25(180)`

`\\ \bull\sf\longmapsto v=45m/s`

Answer 2

⇛Initial velocity (u) = 0 m/s

⇛Acceleration (a) = 0.25 m/s²

⇛Time (t) = 3 minutes

⇛Final velocity (v) = v

Converting 3 minutes into seconds

• 1 minute = 60 second

• 3 minutes = 60 × 3
• 3 minutes = 180 Seconds

☛ Using 1st equation of motion

`\Large\begin{gathered} {\underline{\boxed{ \rm {\red{v \: = \: u \: + \: at}}}}}\end{gathered}`

☛ Substuting the values

`\bf \large \longrightarrow \: \: v \: = \: 0 \: + \: 0.25 \: \: (180)`

`\bf \large \longrightarrow \: \: v \: = \:45 \: m/s`