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dalvyx [7]
3 years ago
10

A puppy weighing 3 kilograms races through the dog park. if she slows from a speed of 2 meters/second to 1 meter/second, what wi

ll happen to her kinetic energy? use the kinetic energy equation.
a.her kinetic energy decreases to 1.5 j
b.her kinetic energy increases to 1.5 j
c.her kinetic energy remains unchanged
d.her kinetic energy decreases to 1 j.
Physics
2 answers:
Ne4ueva [31]3 years ago
6 0
Your answer is A. If velocity decreases, your kinetic energy would also decrease.
sdas [7]3 years ago
5 0

Answer:The correct answer is option (a).

Explanation:

Mass of the puppy,m = 3 kg

Kinetic energy of the puppy when it was running with speed of 2 m/s:

K.E=\frac{1}{2}mv^2=\frac{1}{2}\times 3kg\times (2 m/s)^2=6 Joules

Kinetic energy of the puppy when it was running with speed of 1 m/s:

K.E'=\frac{1}{2}mv^2=\frac{1}{2}\times 3kg\times (1 m/s)^2=1.5 Joules

When the puppy was running at the speed f 1 m/s her kinetic energy reduced to 1.5 Joules.

Hence, correct answer is option (a).

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Explanation:

Make up a question.

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Now since the amount of heat is the same (this starts out on a heated slab of something).

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100 - 2x = x - 20          Add 20 to both sides.

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It tells you that the temperature of the aluminum is only going to drop 10 degrees

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