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Q1. What is the acceleration of two falling sky divers (mass 109.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?

Q2. For the different values given for the radius of curvature and speed, rank the magnitude of the force of the roller-coaster track on the cart at the bottom of each dip.

Q3. A highway curve with a radius of 550 m is banked properly for a car travelling 130 km/h. If a 1660- kg Porshe 928S rounds the curve at 250 km/h, how much sideways force should the tires exert against the road if the car does not skid?

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