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3 years ago

New york to Los Angeles is roughly 2,800 miles. If you drive 70mph, how long will it take to travel that distance?

Physics

1 answer:

Gelneren [198K]3 years ago

7 0

2800 Miles / 70 Miles an hour = 40 hours.

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Read the scenario and solve these two problems.

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Answers:

a) 5400000 J

b) 45.92 m

Explanation:

a) The kinetic energy $K$ of an object is given by:

$K=\frac{1}{2}mV^{2}$

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Solving the equation:

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$K_{i}=5400000 J$ is the train's initial kinetic energy

$P_{i}=0 J$ is the train's initial potential energy

$K_{f}=0 J$ is the train's final kinetic energy

$P_{f}=mgh$ is the train's final potential energy, where $g=9.8 m/s^{2}$ is the acceleration due gravity and $h$ is the height.

Rewriting the equation with the given values:

$5400000 J=(12000 kg)(9.8 m/s^{2})h$

Finding $h$ :

$h=45.918 m \approx 45.92 m$

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