This question is typical on some driver’s license exams: a car moving at 45 km/h skids 15 m with locked brakes. how far will the car skid with locked brakes at 112.5 km/h? assume that energy loss is due only to sliding friction. answer in units of m.

The distance travelled through skiding by car is

Explanation:

Given: A car moving at skids with locked brakes.

As per question,

Final speed is .

Intial speed is

And speed with locked brakes:

Using the formula of laws of motion:

Substiuting the values we get:

Dividing the equation (1) and (2):

Hence, distance travelled through skiding by car is .

Learn more about laws of motion here:

link

from kinematics equation if we know that final speed is ZERO and initial speed is given that due to constant deceleration the object will stop in some distance "d" and this distance can be calculated by kinematics

here acceleration due to friction will be same at all different speed

so for 45 km/h speed the distance of stop is 15 m

while at other speed 112.5 km/h the distance will be unknown

now we will have

now divide above two equations

So it will stop in distance 93.75 m

i think it's 35 meters

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.