What is the maximum height that a car traveling at 150 km/h can achieve when going up a hill? (Assume that only conservative forces are involved.)
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A
The maximum height will depend on the mass of the car.
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B
89 m
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C
2.1 m
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D
1100 m
The maximum height the car can reach is 88.5 Metres.
This is determined by converting its initial kinetic energy into gravitational potential energy. This is based on the principle of conservation of energy.
This is a problem of conservation of mechanical energy, where the initial kinetic energy of the car is converted into gravitational potential energy as the car travels up the hill. The formula for the conversion is:
1/2 mv^2=mgh
where:
- m is the mass of the car (which cancels out),
- v is the velocity (150 km/h = 41.67 m/s),
- g is the acceleration due to gravity (9.8 m/s²),
- h is the height (maximum height the car can reach).
Rearranging to solve for h:
h=v^2/2g
Plugging in the values:
h=(41.67)^2 /(2×9.8) =1736.11/19.6=88.5 m
The maximum height the car can achieve is approximately 88.5 meters. However, rounding and approximations may lead to different answers, but based on the given options, C) is the correct one.

Topic Flashcards
Click to FlipWhat fundamental conservation law is used to solve for the maximum height a car can reach on a hill when only conservative forces act?
The Conservation of Mechanical Energy.
Write the energy transformation equation that states the car's initial kinetic energy is entirelyconverted to gravitational potential energy at the maximum height.
1/2mv =mgh 2
What fundamental physics principle allows us to set the initial kinetic energy equal to the final potential energy to solve for the maximum height?
The Conservation of Mechanical Energy
What is the qualitative relationship between a car's initial speed and the maximum height it can achieve on a hill, assuming no energy losses?
The height is proportional to the square of the initial speed (e.g., doubling the speed quadruples the possible height).
What energy transformation explains why a moving car can coast up a hill to a certain height without its engine?
The conversion of kinetic energy into gravitational potential energy
Would the calculated maximum height be greater if this scenario occurred on a planet with a weaker gravitational acceleration than Earth's?
yes