What has a greater acceleration?

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The discussion revolves around whether a car experiences greater acceleration when the accelerator is fully pressed or when the brake pedal is applied hard. It highlights that acceleration is dependent on the direction of movement and the definition of positive acceleration. A Porsche 911's performance metrics are referenced, noting its 0-60 mph time and braking distance, which suggests that acceleration can vary significantly based on the vehicle and conditions. The conversation hints at the complexity of defining acceleration without clear directional context. Ultimately, the question emphasizes the importance of understanding how acceleration is measured in different scenarios.
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Homework Statement


Is the acceleration of a car greater when the accelerator is pushed to the floor or when the brake pedal is pushed down hard?
 
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What do you think?

Useful data, a Porsche 911 can do 0-60mph in 8secs and 60-0 in 105ft
 
Is this a trick question? (Hint: think about the sign of acceleration)
 
Last edited:
I don't think it can be a trick question since, if it were a trick question, the axis aren't defined. (No one said going forward was positive!)
 
depends on the car. You look at vehicle stats in a magazine, usually they are stated in terms of distancefrom 60mph to zero. Maybe a 100 ft-200 ft. If you have a car that gets to 60mph in 100 feet, you be driving a fuelie.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

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TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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