physicsexam2 - 1 How large a force is required to...

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1. How large a force is required to accelerate a 1600 kg car from rest to a speed of  25 m/s in a distance of 200 m?       Answer:  2500 N 2. A horizontal force of 40 N pushes an object of mass 5.0 kg up an inclined plane  through a distance of 1.6 m measured along the plane.  The plane is inclined at an  angle of 30˚ to the horizontal.  Neglect friction and use g = 10 m/s 2 .        Answer:  15J 3. A force of 15 N applied to a spring stretches it by 4 cm.  What is the potential  energy of the spring in the stretched position?     Answer:  0.3 J 4. A 20-kg object is resting at the top of a table 1.6 m above ground level.  What is  the change in the gravitational potential energy of this object?  Use g = 10 m/s 2 Answer:  1420 J 5. A 500-kg cannon fires a 4.0-kg projectile with a velocity of 500 m/s relative to the  ground.  What is the recoil speed of the cannon?   
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