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 900.
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
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Solution
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mg.dscos900=0
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