Question 17: (1 point) A roller coaster with people on board has a total mass of

Question

Question 17: (1 point) A roller coaster with people on board has a total mass of 4500.0 kg and starts at a height of 22.0 meters with a speed of 2.00 ms. 50.0 KJ of work is done by friction on the way to the bottom of the ride. (Figure 5-13) C. What is the speed at the bottom of the ride? Give to the nearest tenth and use symbols of units (m/s) This is a challenging mult-step question Question 18: (1 point) te from 0.0 to 300 mls in 5.59 seconds. What is the power required? (capital letter symbol for unit)

Explanation / Answer

Apply conservation of energy

total energy at top = kinetic energy at bottom + frction energy

mgh + 1/2 mu^2 = 1/2 m v^2 + friction energy

4500(9.8) (22)+ 0.5(4500) (2)^2 = 0.5(4500) v^2 + 50000 J

929200= 0.5(4500) v^2

v= 20.32 m/s

(18)

P = F v

= ma v

= m ( v-u/t) v

= 2201 ( 30-0/5.59) *30

= 3.54 * 10^5 W

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