14.136 J as shown on the photo with two thought processes but overall same calculation
To that multiply 1.9 by 5 to get 9.5. The zebra has gone 9.5 m.
If we assume that the acceleration is constant, we can use on the kinematic equations:
Vf = Vi + a*t = 15 + 3*4 = 27 m/s
The pitch of a sound is most closely related to the frequency of vibrations.