A block 'A' of mass 45 kg is placed on a block 'B' of mass 123 kg. Now block 'B' is displaced by external agent by 50 cm horizontally towards right. During the same time

Question

A block 'A' of mass 45 kg is placed on a block 'B' of mass 123 kg. Now block 'B' is displaced by external agent by 50 cm horizontally towards right. During the same time block 'A' just reaches to the left end of block B. Initial & final position are shown in figure. Refer to the figure & find the workdone by frictional force on block A in ground frame during above time :-

Options:

Answer:

B

Solution:

Displacement of A w.r.t. ground $= 20 cm$ towards right friction force on $A = 0.2 \times 45 \times 10 = 90 N$ . towards right

$W_{fr} = 90 \times \frac{20}{100} = 18 Nm .$

TestHub · Accepted Answer

Displacement of A w.r.t. ground = 20 cm towards right friction force on A = 0.2 × 45 × 10 = 90 N . towards right W fr ​ = 90 × 100 20 ​ = 18 Nm .

Physics - W.E.P. Question with Solution | TestHub

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