General Science - Physics (Basics)
RRB Group D 2023: A force of 20 N moves an object 3 m at an angle of 60° to the direction of force. What is the work done by the force?
RRB Group D 2023: A force of 20 N moves an object 3 m at an angle of 60° to the direction of force. What is the work done by the force?
medium Q14 of 15
Step-by-Step Solution
Step 1: Understand the formula
Work done, W = Force × Displacement × cos θ.Step 2: Calculate work done
Given Force = 20 N, Displacement = 3 m, θ = 60°.
cos 60° = 0.5.
W = 20 × 3 × 0.5 = 30 Joules.Final Answer:
30 Joules → Option AQuick Check:
Work done = F × d × cos θ = 30 Joules ✅
Quick Trick: Use cos 60° = 0.5 to simplify calculations.
Common Mistakes:
MISTAKES- Ignoring the angle or using sin instead of cos.
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