Question:medium
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Updated On: Jan 19, 2026
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Solution and Explanation
Given:
Mass of car, \( m = 1500 \, \text{kg} \)
Velocity of car, \( v = 60 \, \text{km/h} = 60 \times \frac{1000}{3600} = 16.67 \, \text{m/s} \)
Concept:
Work done to stop the car is equal to the kinetic energy of the car:
\[ W = \frac{1}{2} m v^2 \]
Step 1: Calculate work
\[ W = \frac{1}{2} \times 1500 \times (16.67)^2 \]
\[ W = 750 \times 278 = 208500 \, \text{J} \]
Answer:
The work required to stop the car = 2.085 × 10⁵ J
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