A car weighing 5 tons is moving at a speed of 72 km / h. What work must be done to stop it?
| September 12, 2021 | education
Given:
m = 5 t = 5000 kg;
V = 72 km / h = 72000/3600 = 20 m / s.
Find:
A – ?
Solution:
A = Ek2 – Ek1;
A = mV2 ^ 2/2 – mV1 ^ 2/2;
A = 5000 * 0 ^ 2/2 – 5000 * 20 ^ 2/2;
A = 0 – 5000 * 400/2;
A = – 1,000,000 J.
Answer: 1,000,000 J.
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