Question

An object is thrown straight up. Which of the following is true about

the sign of work

done by the gravitational force while the object moves up and then

down?

A.Work is positive on the way up, work is positive on the way down

B. Work is negative on the way up, work is negative on the way down

C.Work is negative on the way up, work is positive on the way down

D.Work is positive on the way up, work is negative on the way down E.

Work is zero the way up, work is zero on t​

Answer 1

$\huge\mathfrak\red{ANSWER}$

C

Explanation:

WHENEVER AN OBJECT IS THROWN VERTICALLY UPWARDS THEN THE ACCELERATION DUE TO GRAVITY IS RETARDATING FOR THE OBJECT.

WE REPRESENT RETARDATION BY (-) SIGN.

THUS WE CAN SAY WHEN OBJECT US THROWN UPWARDS THEN WORK DONE IS NEGATIVE AS IT IS AGAINST GRAVITY.

NOW WHEN OBJECT COMES BACK DOWNWARDS TO EARTH THE g IS ACCELERATING FORCE AS IT MOVES IN DIRECTION OF GRAVITY. THUS WE CAN SAY THAT WORM DONE WHEN OBJECT MOVES DOWN IS POSITIVE.

THEREFORE THE CORRECT OPTION IS

(C)

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BY SCIVIBHANSHU

THANK YOU

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