3. (a) A cart rolls down a ramp. The cart has a mass of 800 grams (0.8 kg). Using a spring scale, you measure a net force of 4 newtons pulling the car down. Calculate the acceleration of the cart. [3]
(b) An airplane needs to accelerate at 10 m/sec2 to reach take-off speed before reaching the end of the runway. The mass of the airplane is 7,000 kilograms. How much force is needed from the engine? [2]
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