1. A force acting on an object moving along the x axis is given by Fx = (14x – 3.0x²) N where x is in m. How much work is done by this force as the object moves from x = –1 m to x = +2 m? (A) +12 J (B) +28 J (C) +40 J (D) +42 J (E) –28 J

2. The first stage of a Saturn V space vehicle consumes fuel and oxidizer at the rate of 1.50 × 10⁴ kg/s, with an exhaust speed of 2.60 × 10³ m/s. What is the acceleration of the vehicle just as it vertically lifts off the launch pad on the Earth if the vehicle's initial mass is 3.00 × 10⁶ kg? (A) 7.40 m/s² (B) 5.37 m/s² (C) 3.20 m/s² (D) 1.48 m/s² (E) None of the above is correct.

1. A force acting on an object moving along the x axis is given by Fx = (14x – 3.0x²) N where x is in m. How much work is done by this force as the object moves from x = –1 m to x = +2 m?
(A) +12 J
(B) +28 J
(C) +40 J
(D) +42 J
(E) –28 J

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