You are falling down a chasm at 9.80 m/s2. It's a deep chasm, and you've got a calculator with you. If you are currently hurtling toward your doom at 23.016 m/s, how many seconds will it take you to reach terminal velocity of 195 km/h? Your answer must have the appropriate number of significant figures.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.