1 A block is placed on an elevator platform that moves downwardwith decreasing speed. Consider the time interval At, in whichthe speed of the platform changes from v, to zero.Decreasing speed(from v, to zero)Blocka. In the space provided, sketch a free-body diagram for theblock.b. Is the net work done on the block positive, negative, or zero?PlatformFor each force on the free-body diagram, state whether thework done on the block by that force is positive, negative, orzero. Explain.Free-body diagram for blockRank the works you identified above in order of decreasingabsolute value. Explain.c. Consider reference frame R, moving downward withconstant speed v..In reference frame R:Direction ofaccelerationDirection ofi. In the spaces provided, draw arrows to indicatethe direction of the velocity and the accelerationof the block in reference frame R during theinterval At,. Explain.velocityof blockof blockii. In reference frame R:• is the block speeding up, slowing down, or moving with constant speed? (Base youranswer on the directions of the velocity and acceleration).• is the change in kinetic energy of the block positive, negative, or zero? Explain.iii. The work-energy theorem can be applied in any inertial frame of reference. Apply thetheorem to determine whether the net work done on the block is positive, negative, orzero in reference frame R. Explain.

Answered: Image /qna-images/answer/da8a86ba-e2e1-4f52-99d1-eefe2337efdd.jpg

Answered: . A block is placed on an elevator…

Similar questions

Tarzan grabs a vine hanging vertically from a tall tree when he is running at 9.3 m/s. a. How high (in m) can he swing upward? (Enter your answer with respect to the ground.) (Answer in m) b. Does the length of the vine affect this height? (Yes or No)
Two snowy peaks are at heights H = 800 m and h = 740 m above the valley between them. A ski run extends between the peaks, with a total length of 2.91 km and an average slope of 0 = 32° (see the figure). (a) A skier starts from rest at the top of the higher peak. At what speed will he arrive at the top of the lower peak if he coasts without using ski poles? Ignore friction. (b) Approximately what coefficient of kinetic friction between snow and skis would make him stop just at the top of the lower peak? (a) Number i (b) Number i h 0 Units Units 0 H ←
A) A student throws a dart horizontally toward the center of a target, X, at a speed of 20 m/s as shown. The dart flies for 0.1 s and then hits below the center, at Y. How much lower, in m, does it hit? B) A drone at too great a height drops a box. The box drops straight down the ground and hits at 100 m/s smashing the contents. Neglecting air friction, approximately, how high, in m was the drone? C) is in the picture
At a particular instant, a hot air balloon is 48.7m above a horizontal field and descending at a rate of 2.67m/s. At this instant, a girl who is riding in the gondola of the balloon throws a ball with a speed of 14.7m/s with a direction that is horizontal in the frame of the gondola. When the balloon lands on the ground, how far, in meters, is she from where the ball landed? Neglect air resistance.
A golfer hits a shot to a green that is elevated 2.50 m above the point where the ball is struck. The ball leaves the club at a speed of 19.5 m/s at an angle of 40.0° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance, find the speed of the ball just before it lands. V = i
A physics book slides off a horizontal table top with a speed of 1.10 m/s. It strikes the floor after a time of 0.480 s. Ignore air resistance. Find the horizontal distance from the edge of the table to the point where the book strikes the floor.
A skier slides down a hill in a straight line. The hill is 60m high and the coefficient of kinetic friction between the snow and the skis is 0.1. The hill is at an angle of 10 degrees with the horizontal. The mass of the skier is 70 kg. If the skier starts her run from rest and air friction can be ignored, how fast is she moving at the bottom of the hill? Please answer in units of m/s.
A pilot flew his single-engine airplane 60 miles with the wind from City A to above City B. He then turned around and flew back to City A against the wind. If the wind was a constant 20 miles per hour, and the total time going and returning was 1.3 hours, find the speed of the plane in still air.

. A block is placed on an elevator platform that moves downward with decreasing speed. Consider the time interval At, in which the speed of the platform changes from v, to zero.