Q1. A roller-coaster track has six semicircular "dips" with different radii of curvature. The similar roller-coaster cart rides through each dip at the different speed. 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.

Give them rank from largest to smallest. To rank items as equivalent, overlap them.

Q2. An unmarked police car, travelling a constant 94 km/h, is passed by the speeder travelling 153 km/h. precisely 0.70 s after the speeder passes, policeman steps on the accelerator. If the police car's acceleration is 2.30 m/s^2, how much time elapses after the police car is passed until it overtakes the speeder (supposed moving at constant speed)?