(b) An object with mass 60 kg moved in outer space. When it was at location13,-2
ID: 1873094 • Letter: #
Question
(b) An object with mass 60 kg moved in outer space. When it was at location13,-26, -6s speed was 10.5 m/s. A single constant forceN acted on the object while the object moved to location19, 34,-12> m. What is the speed of the object at this finel location? final speed = 11.295 m's Additional Materials Section 6.4 0.75/1 points |I Previous Answors M14 6.4.038 Jack and Jill are maneuvering 3400 kg boat near a dock. Initially the boat's position is force of N. My Notes 2 0 3 > m and its speed is 1.5 m/s As the boat moves to position 6 0 1 > m, Jack exerts force of -450, o 225 > N and ]ill exerts a Jack do? How much work dces Wjack -2250 How much work does Jill do Will0 on exerted a force perper acemen t of the b Jill neither Jack nor Jil Jack both Jack and Jill What is the final speed of the boat? V4 = 11.89 x m/sExplanation / Answer
(B) r = (19 - 13) , (-34 +26), (-12 + 6)
r = < 6 , -8 , - 6 >
F = < 220, 490, -160 >
Work done , W = F.r
= (220 x 6) + (490 x -8) + (-160 x -6)
= - 1640 J
Work done = change in KE
- 1640 = 60 ( v^2 - 10.5^2)/2
v = 7.5 m/s .....Ams
-------------------------------------------------
Net work done = -2250 + 0 = - 2250 J
Work done = change in KE
- 2250 = 3400 (vf^2 - vi^2) / 2
- 1.324 = vf^2 - (1.5)^2
vf^2 = - 1.324 + 1.5^2 = 0.926
vf = 0.96 m/s
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