A porter carries a heavy suitcase while walking horizontally. What is the work done by the force of gravity on the suitcase?
Q1. A porter carries a heavy suitcase while walking horizontally. What is the work done by the force of gravity on the suitcase?
Answer: Zero
Explanation: The dot product is zero when vectors are perpendicular (cos 90 = 0). Option A is wrong because work is a scalar product.