Question

the driver of a moving car suddenly sees a old man. to save the old man he applies a brake which produces an acceleration of 4m/s2. after 3 seconds the car comes to rest. calculate the initial velocity and distance travelled before stopping

Answer 1

from 1st equation of motion
v = u+ at since here acc. is negative
0 =u-12
u=12 m/s
now
from second equation of motion
s = ut +1/2at^2
s= 36 -18
s= 18 m

Answer 2

Answer:

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