Question

Consider the following statements about nature of work done by gravitational force :
a. May be negative
b. May be positive
c. May be zero
d. Always positive

Which of the following option is correct?

• A. a,b & c are correct
• B. a,b & d are correct
• C. a,c & d are correct
• D. all correct

Answer 1

Answer: (A)

Case of negative work:- When a body possesses a velocity opposite to the direction of gravity.
eg:- Ball thrown upwards from ground
Case of positive work:- When body possesses a velocity parallel to the direction of gravity.
eg:- Ball falling from a cliff.
Case of zero work:- when displacement is zero.
eg:- Ball kept on a horizontal table at rest.