4.) it was once recorded that a jaguar left skid marks which were +300 m in length.
assuming that the jaguar skidded to a stop with a uniform acceleration of -4.00 m/s,
determine the velocity of the jaguar before it began to skid.
a.) 49 m/s
b.) 60 m/s2
c.) 10 m/s
d.) 49 m/s?

Initial velocity of the jaguar: 49  (answer d)

Explanation:

Considering that this uniformly accelerated problem (with negative acceleration since the jaguar was reducing its velocity to full stop), does not include the time the jaguar was skidding , we can use the kinematic equation that doesn't include time, but relates velocities (initial and final) with the acceleration (), and the distance "D" covered during the accelerated motion:

For our problem, the initial velocity ( is our unknown, the final velocity is zero ( - since the jaguar stops in the process),  the negative acceleration is given as , and the distance D of the skid marks is said to be 300 m in length. Therefore:

Which we can round to 49

answer; how far out of place which the object finished relative to the starting location;