lightning and thunder both occur at the same time why do you see the Lightning before you hear the thunder
2 answers:
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Answer:
21.42m/S
Explanation:
Hello!
To solve this problem we must perform the following steps.
1. Find the distance traveled from until the driver reacts, this is achieved using the equation for constant speed movement.
X1=VT
where
x= distance traveled
v=initial speed
T=time=0.75s
X1=0.75Vo
we must take into account that the total distance is the sum of the distance at which the pilot reacts (x1) and when it starts to decelerate (x2)
39=0.75Vo+X2
X2=39-0.75Vo
2. Now we use the equation that defines a movement with constant acceleration.
where
Vf = final speed=0m/s
Vo = Initial speed
A = acceleration =-10m/s2
X2 = displacement
now we use the ecuation of step 1
solving
Now we solve the quadratic equation and find the value of Vo
the solutions are 21.42m/S, -36.41m/S
as the speed must be positive we conclude that the answer is 21.42m/S