Find the initial velocity of a car ,which is stopped in 20 seconds by applying brakes the retardation due to brakes is 4.5 metre per second square?
Answers
Answered by
0
Given :-
Time = 20 seconds
Acceleration = 4.5 m/s²
Final velocity = 0 m/s (As it stops)
To Find :-
Initial velocity
Solution :-
We know that
v = u + at
Where
v = final velocity
u = initial velocity
a = acceleration
t = time
0 = u + (-4.5)(20)
0 = u + (-90)
0 - u = -90
- u = -90
u = 90
Therefore
Initial velocity is 90 m/s
Know More :-
Equations of motion
v = u + at
s = ut + 1/2 × at²
v² - u² = 2as
Where
v = final velocity
u = initial velocity
a = acceleration
t = time
s = distance
Similar questions