I need help with these questions. 1. You are pulling your little sister on her s

Question

I need help with these questions.

1. You are pulling your little sister on her sled across an icy (i.e. frictionless) surface. When you exert a constant horizontal force of 120 N, the sled has an acceleration of 2.5 m/s2. If the sled has a mass of 7.4 kg, what is the mass of your little sister? (in kg)

2,. A 80-kg water skier floating in a lake is pulled from rest to a speed of 15 m/s in a distance of 25 m. What is the net force exerted on the skier (assuming his acceleration is constant)? (in N)

3. On an aircraft carrier, a jet can be catapulted from 0 to 160 mi/h in 2 s. If the average force exerted by the catapult is 8.5 x 105 N, what is the mass of the jet? (in kg) (Note: careful with units!)

Explanation / Answer

Picture the Problem: You exert a horizontal force that accelerates both your little sister and the sled.
Strategy: Apply Newton

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