A car going 72.0 km/h (20.0 m/s) slows down to 36.0 km/h (10.0 m/s) in 5.00 seconds. Calculate the acceleration in m/s2.
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Answer:
20.0ms slows down 36.0 km /h
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To find :
The acceleration of car in m/s²
Given :
- initial velocity , u= 70km/h or 20m/s
- final velocity , v = 36km/h or 10m/s
- time = 5 s
Formula to be applied:
- acceleration = (v-u)/t
Solution :
given, v = 10 m/s
u = 20 m/s
t = 5
So, acceleration = (v-u)/t
or, acceleration = (10-20)/5
acceleration = (-10)/5
or, acceleration = -2 m/s²
so, The acceleration is negative
hence, retardation = 2m/s²
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