Kinematics Equations Video Lessons

Concept

# Problem: A cheetah spots a Thomsons gazelle, its preferred prey, and leaps into action, quickly accelerating to its top speed of 30 m/s, the highest of any land animal. However, a cheetah can maintain this extreme speed for only 15 s before having to let up. The cheetah is 290 m from the gazelle as it reaches top speed, and the gazelle sees the cheetah at just this instant. With negligible reaction time, the gazelle heads directly away from the cheetah, accelerating at 4.6 m/s2 for 5.0 s, then running at constant speed.Does the gazelle escape?

###### FREE Expert Solution

We'll consider the kinematic equations:

Let both the cheetah and the gazelle be moving in the x-direction.

The initial position of the cheetah, x0c = 0m

The initial position of the gazelle, x0g = 290 m

The cheetah accelerates to the top speed in no time.

The velocity then remains constant in the entire path.

vc = 30 m/s

The cheetah maintains the top speed for 15s.

93% (49 ratings)
###### Problem Details

A cheetah spots a Thomsons gazelle, its preferred prey, and leaps into action, quickly accelerating to its top speed of 30 m/s, the highest of any land animal. However, a cheetah can maintain this extreme speed for only 15 s before having to let up. The cheetah is 290 m from the gazelle as it reaches top speed, and the gazelle sees the cheetah at just this instant. With negligible reaction time, the gazelle heads directly away from the cheetah, accelerating at 4.6 m/s2 for 5.0 s, then running at constant speed.

Does the gazelle escape?