Question

Determine the stopping distance for a car traveling at 10 m/s for an acceleration of -4 m/s2 .

Answer 1

• Initial velocity=u=10m/s
• Final velocity=v=0m/s
• Acceleration=a=-4m/s^2
• Distance be s

Apply third equation of kinematics

$\\ \rm\rightarrowtail v^2-u^2=2as$

$\\ \rm\rightarrowtail -(10)^2=-8s$

$\\ \rm\rightarrowtail -100=-8s$

$\\ \rm\rightarrowtail s=12.5m$