2. A car moving at 36 km/h speeds upto 72 km/h in 5 seconds. What is its acceleration? If the same car stops
in 20 seconds, what is the retardation?
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EXPLANATION.
- GIVEN
A car moving at 36 km/hr speed upto 72 km/hr
time taken = 5 seconds.
1) = find it's acceleration.
according to the question,
initial speed = u = 36 km/hr
=> 36 X 5/18 = 10 m/s
final speed = v = 72 km/hr.
=> 72 X 5/18 = 20 m/s
Time = 5 seconds.
From newton first equation of
kinematics.
=> v = u + at
=> 20 = 10 + 5a
=> 10 = 5a
=> a = 2 m/s²
If the same car stops in
20 seconds, what is the retardation?
=> v = 0
=> u = 20 m/s
=> t = 20 seconds.
From newton first equation of
kinematics.
=> v = u + at
=> 0 = 20 + 20a
=> a = -1 m/s
Retardation time = -1 m/s²
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