Help with technical physics!!

Posted on 2014-12-18 06:54:00 in Physics by MATIN

A box of mass 10 kg is pushed across the floor with a force of 25 N. A 2 N frictional force opposes the motion.

1.What is the acceleration of the box?

2. A firefighter of mass 80 kg slides down a vertical pole with an acceleration of 4 m/s

3. What is the frictional force that acts on the firefighter?

4. A catapult on an aircraft carrier is used to launch a 20,000 kg plane. Assume the catapult brings the plane from rest up to a speed of 70 m/s in 5.0 seconds. What is the force on the plane?

5. A skydiver and her parachute have a mass of 50 kg. What is the force of air resistance when she reaches terminal velocity?

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