Find out the speed of a 56.7 kg thrill seeker at the bottom, Ask an Expert

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Q1. A motorist travelling with constant velocity of 15 m/s (about 34 mph) passes a school crossing corner, where the speed limit is 10 m/s (about 22 mph). Just as the motorist passes, a police officer on a motorcycle stopped at the corner starts off in pursuit with constant acceleration of 3.0 m/s

(a) How much time elapses before the police catches the motorist?

(b) What is the officer's speed at that point?

Q2. Assume a slide similar to Der Stuka is 35.6 meters high, but is a straight slope, inclined at 45° with respect to horizontal.

(a) Find out the speed of a 56.7 kg thrill seeker at the bottom of the slide, assume no friction.

(b) If the thrill seeker has a speed of 24.1 m/s at the bottom, find out the change in mechanical energy due to friction.

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