A variable force (in Newtons) acting in an object is represented by the function F(x) x-4x+7, where x is the distance in meters from the origin. How much work is required to move the object from x-1 to x-4. Belect one: a. 15J Ob. 131 e, 193 Od. 143

A stone is thrown straight up from the edge of a roof, 950 feet above the ground, at a speed of 10 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later? B. At what time does the stone hit the ground? C. What is the velocity of the stone when it hits the ground?

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