Can u graph it and sove it please, and then conculde it with why this solution i

Question

Can u graph it and sove it please, and then conculde it with why this solution is reasonable ? Thank u. Item 8 A cable lowers a 1400 kg elevator so that the elevator's speed increases from zero to 4.0 m/s in a vertical distance of 5.7 m Part A what is force that catie exerts on the elevator while lowering r?(Assume that the system is the elevator and Earth.) Express your answer to two significant figures and include the appropriate units FoomE Value Units Submit My Answers Givse Part B What is the force that the cable exerts on the elevator while lowering i? (Assume that the system is the elevator only) Express your answer to two significant figures and include the appropriate units FoonValue Units Submit My Answers ivs a Continue

Explanation / Answer

Work done by the cable + work done by the gravity = change in kinetic energy

Wc+Wg = 0.5*m*(v^2-u^2)

Wg = m*g*h = 1400*9.81*5.7 = 78283.8 J

then Wc = 0.5*1400*(4^2-0^2) - 78283.8

Wc = 11200-78283.8 = -67083.8

-Fc*S = -67083.8

Fc = 67083.8/5.7 = 11769 N

B) Wc = change in KE

Wc = 0.5*m*(v^2-u^2) = 0.5*1400*(4^2-0^2) = 11200 J

Fc*S = 11200

Fc = 11200/5.7 = 1965 N

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