Question

1. State (with reasons) whether work done in the
following cases is positive or negative:
a. Work done by a boy in pulling a toy car
b. Work done in pulling a string
c. Work done in dropping a stone down
d. Work done in throwing a ball up​

Answer 1

Answer:

1. State (with reasons) whether work done in the

following cases is positive or negative:

a. Work done by a boy in pulling a toy car

b. Work done in pulling a string

c. Work done in dropping a stone down

d. Work done in throwing a ball up

Answer 2

Answer:

a. positive ( Because when he pulls the car force is in the same direction and car moves is same direction)

b. negative (Because when he pulls the string it goes opposite to and fro up and down it is not stable)

c. positive ( when we drop any object it comes down due to gravity)

d. positive (when we throw it goes in same direction where we throw and it comes down due to gravity

Explanation:

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