Question

It was once recorded that a Jaguar left skid marks that were $290m$ in length. Assuming that the Jaguar skidded to a stop with a constant acceleration of $-3.90m/s^2$, determine the speed of the Jaguar before it began to skid.

• A. $47.6m/s$
• B. $38.2m/s$
  
• C. $54.6m/s$
  
• D. $57.6m/s$
  

Answer 1

The correct option is A $47.6m/s$

Final velocity $v=0$
Acceleration of Jaguar $a=-3.9m/s^2$
Distance covered $s=290m$
Using $v^2-u^2=2aS$
$\therefore 0-u^2=2(-3.9)\left(290\right)$
$⟹u=\sqrt{2\left(3.9\right)\left(290\right)}=47.6m/s$