The daredevil crawls out until the cord breaks, and then swings down holding on to the beam. The mass of the beam is 250 kg, and the mass of the daredevil is 85 kg. The length of the beam is 15 m. Before the cord breaks, θ = 50° and the angle the cord makes with the normal to the beam is φ = 20°. Find the distance out along the beam (x) the daredevil will be when the cord breaks.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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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."

wavelength divides in half and speed stays the same.