To determine the speed of the Jaguar before it began to skid, we can use one of the kinematic equations of motion. The relevant equation relates initial velocity \( v_0 \), final velocity \( v \), acceleration \( a \), and distance \( d \):
\[
v^2 = v_0^2 + 2ad
\]
In this scenario:
- The final velocity \( v \) is \( 0 \) m/s (since the Jaguar comes to a stop).
- The acceleration \( a \) is \( -3.90 \, \text{m/s}^2 \) (negative because it's