116 3. The platform moves downward with decreasing speed. y direction a. In the

Question

116 3. The platform moves downward with decreasing speed. y direction a. In the space provided, draw an amowto indicate the decreasing direction of the acceleration of block C. Ifthe acceleration is zero, state so explicitly. Explain. Acceleration of block C b. Is the work done on block C by the platform partive, negative, or zero? Explain. afthere is no such work, state so explicitly) c. Would your answer to the previous question (about whether the work on block Cbythe platform is positive, negative, or zero) change if you were to use the convention that the positive y direction is downward? Explain. Taarials in Introductory Physics CPrentice Hall, Inc., McDermott Shaffer, and PEG. U. Wash. First Edition, 2003

Explanation / Answer

a) if a body having decreasing speed then the velocity vector and acceleration vector both are acting in opposite directions

so acceleration of c block is acting upwards .

b) w = f*s

f = ma

here a is in upward direction s is in down ward direction

so work done is negative

c) if positive y direction is downwards then work is positive

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