Question

Assertion (A) : No work is done by gravitational force if a body moves along a horizontal surface.
Reason (R) : In horizontal motion, angle between gravity and displacement is ${90}^0$.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. Both (A) and (R) are true and (R) is not the correct explanation of (A)
• C. (A) is true and (R) is false
• D. (A) is false and (R) is true

Answer 1

Answer: (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

$mg.dscos{90}^0=0$