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A 3000 lb car has an initial velocity of 10 mi/h. How much force is required to accelerate the car to a speed of 50 mi/h in 10 seconds?

A 25 N box is pulled vertically upward by means of a cord. Find the acceleration of the box if the tension in the cord is 35 N.

1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height?