An aircraft of 2 metric tonnes lands with 400 kilojoules of energy, 10 kiloNewtons of force is applied at the brakes, how far does the aircraft take to stop?
- 40 M.
- 80 M.
- 20 M.
Explanation
The braking force does work equal to the kinetic energy absorbed: distance = energy / force = 400 000 J / 10 000 N = 40 m. The aircraft's 2 tonne mass is not required because the energy is already given. The 80 m and 20 m answers come from misdividing the energy by the force.
arifadli8 asking:
i think the answer is wrong...
cause i get the distance is 80m
Community Comments (1)
D
dimky Posts: 514 06.09.2013 / 18:42
Work done = Force * energy.
Work required to convert all the kinetic energy = Force * distance.
So Force * distance = 400,000 Joules.
10,000 N * distance = 400,000.
Distance = 40 m.
Work required to convert all the kinetic energy = Force * distance.
So Force * distance = 400,000 Joules.
10,000 N * distance = 400,000.
Distance = 40 m.
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