Question

A car starts from rest and acceleration at 4 m/s? find its final velocity after 5 seconds.​

Answer 1

$\mathcal{\green{\underline{\blue{GIVEN:}}}}$

• Initial velocity (u) = 0ms⁻¹. [Car starts from rest]
• Acceleration (a) = 4ms⁻².
• Time (t) = 5 seconds.

$\mathcal{\green{\underline{\blue{TO \:\: FIND:}}}}$

• Final velocity (v) = ?

$\mathcal{\green{\underline{\blue{SOLUTION:}}}}$

Recall the three equations of motion:

$\huge\star\:\:{\orange{\underline{\pink{\mathbf{v=u+at}}}}}\\\huge\star\:\:{\orange{\underline{\pink{\mathbf{2as=v^2-u^2}}}}}\\\huge\star\:\:{\orange{\underline{\pink{\mathbf{s=ut+\frac{1}{2}at^2 }}}}}$

It is very appropriate to use the first equation, because we are given u, a and t.

$\to {\pink{v=u+at}}$

Substitute the values.

$\to v= 0+ 4 \times 5$

$\to v=20ms^{-1}$

FINAL VELOCITY - 20ms⁻¹.

$\huge\underline\mathfrak\purple{HOPE \:\: THIS \:\: HELPS \:\: :D}$