Question

18. A boy of mass 55 kg, runs up 40 stairs, each measuring a height of 0.15 min 5 s. Column
gives numerical values for quantities described in column 1. Match both the columns and so
the correct option from the codes given below.
Column 1
Column 1
(a) Work done by all the forces
(1) Change in potential energy
(b) Work done by conservative forces
(11) Change in Kinetic energy
(c) Work done by external forces
(ili) Change in mechanical energy
(d) Work done in uniform acceleration
(iv) Zero
(A) (a) - (ii), (b) - (), (c) - (iii), (d) - (iv)
45) (a) - 0. (1)-(e)n. (3) - (0)
(C) (a) - (iii), (b) - (iv), (C) - (ii), (d) - (i)
(D) (a) - (iv) (1) (0)​

Answer 1

Answer:

2) Given that,

m=0.05 and v=20m/s

1

Maximum potential energy at highest point= Initial kinetic energy at the bottom point

∴Maximum potential energy =

2

1

mv

2

=

2

1

×0.5×20×20

=

2

200

=100J

3) Given that,

m=0.05 and v=20m/s

1

Maximum potential energy at highest point= Initial kinetic energy at the bottom point

∴Maximum potential energy =

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Explanation: