Question

How many cotton can be shuffled in a room of dimension 4m by 3m by 1m. Assuming that 1kg cotton requires 0.8 cube of space?

Answer 1

Correct option is

D

5

2

m

Figure shows the bold line whose length we have to calculate

Using 3D version of pythagoras

d

2

=a

2

+b

2

+c

2

d

2

=3

2

+4

2

+5

2

d

2

=9+16+25

d

2

=50

d=

50

d=5

2

m

Therefore the magnitute of the displacement of the fly is 5

2

m

solution

Answer 2

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Correct option is

D

5

2

m

Figure shows the bold line whose length we have to calculate

Using 3D version of pythagoras

d

2

=a

2

+b

2

+c

2

d

2

=3

2

+4

2

+5

2

d

2

=9+16+25

d

2

=50

d=

50

d=5

2

m

Therefore the magnitute of the displacement of the fly is 5

2 m