Q1. A car travelling east at 38.0 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 2.90 s. How far does the car travel in the 2.90-s time period?
Q2. A mass m = 6.7 kg hangs on the end of a massless rope L = 2.1 m long. The pendulum is held horizontal and released from rest.
Now a peg is placed 4/5 of the way down pendulum's path so that when the mass falls to its vertical position it hits and wraps around the peg. As it wraps around the peg and attains its maximum height it ends a distance of 3/5 L below its starting point (or 2/5 L from its lowest point).
What is the magnitude of the tension in the string at the top of new path (directly above the peg)?