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yaroslaw [1]
3 years ago
14

This question is typical on some driver's license exams: A car moving at 50 km/h skids 15 m with locked brakes. How far will the

car skid with locked brakes at 150 km/h?
Physics
1 answer:
yulyashka [42]3 years ago
7 0

Answer: 135 m

Explanation: In order to solve this problem we have to use the kinematic equations given by:

Xf= vo-(a/2)*t^2

Vf=vo-a*t

then we have for the first case:

t=vo/a

15 m= (vo^2/)a- (a/2)*vo^2/a^2= vo^2/2a

then a = (50 km/h*(1000/3600))^2/2*15= 6.43 m/s^2

With this value of the acceleration we solve the set of equation for an initial speed of 150 km/h

xf= vo^2/2a= 150*(1000/3600)^2/(2*6.43)=135 m

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Explanation:

From Newton's law of motion, we know that;

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We are given;

m = 1.81 × 10^(−3) kg

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a = [(1.22 × 10 ^(−8)) × (3.00 × 10⁴)ȷ^ × ((1.63T) ı^ + (0.980T) ȷ^)]/(1.81 × 10^(−3))

From vector multiplication, ȷ^ × ȷ^ = 0 and ȷ^ × i^ = -k^

Thus;

a = -0.33 m/s² k^

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