A tall man walking at 1.25 m/s accidentally bumps his head of mass 2.95 kg on a steel doorframe. His head stops in 0.011 s. a. What is the magnitude of the average force exerted by the doorframe on the man's head?
b. Explain why putting padding on the doorframe would help reduce this force.

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Explanation:

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards