a bus travelling at 36 km per hour speed up to 72 km per hour in 5 second what it is acceleration if the same cost of in 20 second what is the retired extradition
Answers
Answered by
3
Answer:
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
Explanation:
Similar questions