Acar goes from 80 km/h to 20 km/h in 0.5 h. what is the acceleration in km/h2?

The answer is -120 km/h².

The acceleration is the change in velocity during the time. It can be expressed as:


where:
a - the acceleration of the object,
v₁ - the initial velocity of the object,
v₂ - the final velocity of the object,
t - time

It is given:
v₁ = 80 km/h
v₂ = 20 km/h
t = 0.5 h
a = ?

Thus:


Therefore, the acceleration of the car is -120 km/h2

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