The speed of the train in 20 seconds decreased from 72 to 54 km / h, which is equal to the acceleration of the train when braking.
| November 29, 2020 | education
Given: v0 = 72 km / h, v = 54 km / h, t = 20s
Find: a
Decision:
Let’s find the acceleration by the formula a = (v-v0): t, a = (54-72): 20 = -0.9 m / s2
Answer: -0.9 m / s2
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