If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2

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Question: If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)

Options:

Correct Answer: 2000 J

Exam Year: 2021

Solution:

Convert speed to m/s: 36 km/h = 10 m/s. KE = 1/2 * m * v^2 = 1/2 * 1000 kg * (10 m/s)^2 = 50000 J.

If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)

If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)

Step 1: Identify the mass of the car, which is 1000 kg.
Step 2: Identify the speed of the car, which is 36 km/h.
Step 3: Convert the speed from km/h to m/s. To do this, divide 36 by 3.6. This gives you 10 m/s.
Step 4: Use the formula for kinetic energy (KE), which is KE = 1/2 * m * v^2.
Step 5: Plug in the values: KE = 1/2 * 1000 kg * (10 m/s)^2.
Step 6: Calculate (10 m/s)^2, which is 100 m^2/s^2.
Step 7: Multiply 1000 kg by 100 m^2/s^2 to get 100000 kg*m^2/s^2.
Step 8: Now multiply by 1/2, which gives you 50000 J (Joules).

Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 * m * v^2.
Unit Conversion – Converting speed from kilometers per hour to meters per second is essential for using the kinetic energy formula correctly.