A toy is acted upon by a force. State two conditions under which the work done could be zero.
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We know that W = FScosθ. clearly, work done by the force will be zero if.
1. S = 0 i.e., no displacement takes place
2. If θ = 90°, then cos 90° = 0, and W = 0;.e., when the force acts perpendicular to the direction of motion.