Question

diagram with dierent numbers) 30レ A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22.0 meters with a speed of 2.00 ms. 50.0 on on the way to the botiom of the ride. (See Figure 5-13) What is its iniial potenSal envergy. in whole number kilojoules? (Since the unit is given in the question, do not put it in the answer box.) Question 16:(1 point) kJ of A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s. 50.0 work is done by friction on the way to the bottom of the ride. (Figure 5-13) B. What is its initial kinetic energy, in kJ 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 m/s 50.0 KJ of work is done by friction on the way to the bottom of the ride. (Figure 5-13)

Answer 1

Initial kinetic energy of the roller coaster = (1/2)mV²
where m is the mass of the Coaster with people = 4500 kg
and V is the velocity of the roller coaster = 2m/s
Now putting the value
Kinetic energy = (1/2)*(4500)*(2)² = 9000 J
But answer is asked in kJ
1 kJ = 1000 J
therefore kinetic energy = 9 kJ