Explanation
Hint: Apply Work-enegy theorem
Correct option: A
Explanation for correct option:
∴W=ΔK
Step2: Find work done
ΔK= Final Kinetic energy - Initial Kinetic energy
Initial kinetic energy will be zero as the object comes to rest.
ΔK=0−12mv2=−12mv2
∴W=−12mv2
Hence, option A is correct.
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