✎ Problem:

A 5000 kg bus has a velocity of 8 m/s. What is the kinetic energy of the bus?

✎ Answer and solution:

✍︎ Kinetic energy is the energy possessed by a moving body by virtue of its mass and velocity. It is calculated by the formula

• KE = ½ (mass × velocity²), where KE is in joules, mass is in kg and velocity is in m/s.

The solution:

Given that

• mass: 5,000 kg
• velocity: 8 m/s
• KE: ?

We can now calculate the KE of the bus

• KE = ½ (mass × velocity²)
• KE = ½ [5,000 kg × (8 m/s)²]
• KE = ½ (5,000 kg × 64 m²/s²)
• KE = ½ (320,000 J)
• ∴ KE = 160,000 J <answer>

Hope This Helps

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