Question

A dolphin has a mass of 125 kg and is moving along with 775 J of kinetic energy. How fast is it moving? (Hint: use the formula to solve for KE)

Question 43 options:

12.4 m/s


3.52 m/s


0 m/s


6.2 m/s

Answer 1

Answer: 3.52m/s

Explanation:

Kinetic energy is calculated as:

= 1/2mv²

where,

m = mass

v = velocity

Therefore,

775 = 1/2 × 125 × v²

775 = 62.5v²

v² = 775/62.5

v² = 12.4

v = ✓12.4

v = 3.52m/s