Question

Sally , who has a mass of 68kg , is sledding at the park . She places her 6-kg sled at the top of a hill and then runs with a velocity of 3 m/s and jumps on it . What is the combined velocity of sally and the sled right after she jumps on in m/s? (Round your answer to one decimal place if necessary.)

Answer 1

Answer: 2.76 m/s.

Explanation:

68 kg × 3 m/s + 6 kg × 0 m/s = (68 kg + 6 kg) × vf

Simplifying the equation, we get:

204 kg·m/s = 74 kg × vf

Dividing both sides by 74 kg, we get:

vf = 204 kg·m/s ÷ 74 kg

vf ≈ 2.76 m/s