Question

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Q3. When a person carries a suitcase in his hand or on his head, the work done by the
person against gravity is zero. However, the person may be doing work against the
force of friction and air resistance. There are many activities we do, but they do not
involve any work.
a) Why work done is zero by a person carrying a suitcase on his head.
(1)
b) State the condition under which work done is positive and negative.
(1)
c) Mention two activities which are strenuous but do not involve any work.
(1)
d) Several forces are acting on a body. Under what condition, the acceleration in
the body is zero.
(1)​

Answer 1

Answer:

d is the correct answer

Answer 2

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