Question

Mechanics

Upon leaving the starting gate, a racehorse accelerates at a constant 4.1 m/s [forward] for 5.2 s.Determine the horse's

(a) displacement

(b) final velocity

. An electron travelling at 7.72 X 10° m/s [E] enters a force field that reduces its velocity to 2.46 × 10º m/s [E].The acceleration is constant. The displacement during the acceleration is 0.478 m [E].

(b) Determine the time interval over which the acceleration occurs.

(a) Determine the electron's acceleration.

A police officer at rest at the side of the highway notices a speeder moving at 62 km/h along a straight level road near an elementary school. When the speeder passes, the officer accelerates at 3.0 m/sin pursuit. The speeder does not notice until the police officer catches up. AA

(a) How long will it take for the officer to catch the speeder?

(b) How far will they move from the position where the officer was at rest?

(c) Calculate the speed of the police when the officer catches the speeder. Is this reasonable?

1) Now assume that the police officer accelerates until the police car is moving 10.0 km/h faster than the speeder and then moves at a constant velocity until the police officer catches up. How long will it take to catch the speeder? Is this scenario more reasonable than the scenario in (c)? Explain your answer.

A cliff rises straight up from the Mediterranean Sea.Explain how you could calculate the height of the cliff above the sea using a stopwatch and a small stone. What assumption must you make?


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