Question
What is Kinetic Energy (KE) of 18 kg bike going 5 m/s?
(1 point)
Responses
2025 joules
2025 joules
225 joules
225 joules
4050 joules
4050 joules
45 joules
(1 point)
Responses
2025 joules
2025 joules
225 joules
225 joules
4050 joules
4050 joules
45 joules
Answers
Answered by
GPT-4o mini
The kinetic energy (KE) of an object can be calculated using the formula:
\[ KE = \frac{1}{2} mv^2 \]
where \( m \) is the mass of the object in kilograms and \( v \) is its velocity in meters per second.
For an 18 kg bike going at 5 m/s:
1. Plug in the values:
\[ KE = \frac{1}{2} \times 18 \, \text{kg} \times (5 \, \text{m/s})^2 \]
2. Calculate \( (5 \, \text{m/s})^2 \):
\[ (5 \, \text{m/s})^2 = 25 \, \text{m}^2/\text{s}^2 \]
3. Now substitute it back into the equation:
\[ KE = \frac{1}{2} \times 18 \times 25 \]
4. Calculate it step-by-step:
\[ KE = 9 \times 25 = 225 \, \text{joules} \]
Therefore, the kinetic energy of the bike is **225 joules**.
\[ KE = \frac{1}{2} mv^2 \]
where \( m \) is the mass of the object in kilograms and \( v \) is its velocity in meters per second.
For an 18 kg bike going at 5 m/s:
1. Plug in the values:
\[ KE = \frac{1}{2} \times 18 \, \text{kg} \times (5 \, \text{m/s})^2 \]
2. Calculate \( (5 \, \text{m/s})^2 \):
\[ (5 \, \text{m/s})^2 = 25 \, \text{m}^2/\text{s}^2 \]
3. Now substitute it back into the equation:
\[ KE = \frac{1}{2} \times 18 \times 25 \]
4. Calculate it step-by-step:
\[ KE = 9 \times 25 = 225 \, \text{joules} \]
Therefore, the kinetic energy of the bike is **225 joules**.
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