In the speed-time graph for a moving object shown here, the part which indicates uniform deceleration of the object is:

(a) QR

(b) ST

(c) RS

(d) PQ​

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Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?