Question

4. The velocity of an object starting from rest is 40 m/s after 5 seconds. Calculate the acceleration of the object ​

Answer 1

Given :

• Final velocity (v) = 40 m/s
• Initial velocity (u) = 0 m/s (as it is starting from rest)
• Time (t) = 5 seconds

To find :

• Acceleration (a)

Accordingto the question,

$\bullet \: { \underline{ \underline{\boxed{\sf \red{v = u + at}}}}} \\ \\ \implies\sf{40 = 0 + a \times 5} \\ \\ \implies\sf{40 - 0 = 5a} \\ \\ \implies \sf{40 = 5a} \\ \\ \implies\sf{ \cancel\dfrac{40}{5} {}^{ \: 8} = a } \\ \\ \implies{ \underline{\boxed {\sf{ a = 8 {ms}^{- 2} }}}}$

So,the acceleration is 8 m/s²...

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$\bigstar \: {\underline{ \overline{ \sf \red{More \: Formula}}}} \\ \\ \bullet \: \sf{ v = u + at} \\ \\ \bullet \: \sf{ {v}^{2} = {u}^{2} + 2as} \\ \\ \bullet \: \sf{s = ut + \dfrac{1}{2} {at}^{2} }$