13-11 | Kinetics of a Particle | Chapter 13: Hibbeler Dynamics 14th ed | Engineers Academy

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Chapter 13: Kinetics of a Particle : Force and Acceleration
Hibbeler Dynamics 14th ed

13–11.
Determine the time needed to pull the cord at B down 4 ft starting from rest when a force of 10 lb is applied to the cord. Block A weighs 20 lb. Neglect the mass of the pulleys and cords.

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From 7:06. I didn't use the datum method. Instead I used the equations of motion, with change in s = 0 - (-4) = 4ft. I got final velocity = 16.05 and the time to be 0.498s..however when dividing this time by 2, I got 0.249s.. Is this method correct?

captain_ali_
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Can you please solve the problem no. 13-76 ?

muhammadusamaarshad