A car travelling at 36km/h speeds upto 72km/h in 5sec. What is its
acceleration? If the same car stops in 20s, what is the retardation?
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A car travelling at 36 km/h speeds up to 72 km/h in 5 seconds. What is its acceleration? If the same car stops in 20 seconds, what is the retardation?
Dell Precision mobile workstations.
u = 36 km/hr = 36 * (5/18) = 10 m/s
v = 72 km/hr = 20 m/s
Using Newton's first eqn. of motion :
v = u + at
20 = 10 + a(5)
Hence a = 2 m/s²
Now the car stops in 20 seconds :
Using the same equation :
v = 0
u = 20 m/s
t = 20 sec
a = ?
0 = 20 + a (20)
a = -1 m/s²
In 2nd case there is retardation of 1 m/s²
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