-2 penb 204 N m s fixed at the top o itio cos plane incired at an angle S lane I
ID: 1787039 • Letter: #
Question
-2 penb 204 N m s fixed at the top o itio cos plane incired at an angle S lane Incined at an 40° poc the figure balow . A 1.0 kg block s projected up the planc the flaure bsow). A 1.o rem an irital pocition thatd stanco d dof the reisxed spring, with an n A spring 0 GO n om the end a the reaxed spring with an in tia kinatic cncrgy of 17 . What is the linctic enargy of the black at the instant it has comprezod the spring 0.20 m? :b:with what dnctic onengv must the block bc projected up the plane (frem its inital pocition) if it is toop momentarily when it has compressed the spring by D.40 m? n the figure below, the pull has negli ible mass, and oth it and the indi ed plane re frictio ess. 0lock A hes a mass of 1.0 kg and block hasmass of 2.0 kg and angle is 30 shat is their totalk r the blods re released from rest ith the c r ecting c d taut inetic energy her blockExplanation / Answer
a) Initial KE = final KE + PE of spring + PE of mass
=> 17 = final KE + 0.5*204*0.2^2 + 1*9.8*0.8*sin40°
=> final KE = 7.88 J
b) Initial KE = final KE + PE of spring + PE of mass
=> Initial KE = 0 + 0.5*204*0.4^2 + 1*9.8*1.0*sin40°
=> Initial KE = 22.62 J
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