Question

What is the final speed of a racing car that accelerates in a straight line form rest for 8s at 4m/s^2

Answer 1

Given,

u=0

t=8s

a= 4m/s

Applying formula,

$s = ut + \frac{1}{2} a {t}^{2}$

s= 0× 8+ 1/2× 4×8 ×8

s=0+128

s=128m

Then applying,

${v}^{2} - {u}^{2} = 2as$

V²-0=2×4×128

v²=1024

v=32