Verified Solution • 2025–26 Session moderate

QJEEM23Phc4fa: JEE Main 2023 Physics - Class 11 JEEM23Phc4fa Solution: A 0.4 kg mass takes 8s to reach ground when dropped from a…

A 0.4 kg mass takes 8s to reach ground when dropped from a certain height 'P' above surface of earth. The loss of potential energy in the last second of fall is __________ J.

(Take g = 10 m/s 2^2 )

Step-by-Step Verified Solution

Displacement is 8th 8^{\text {th }} sec.

S8=0+12×10×(2×8−1)\mathrm{S}_{8}=0+\frac{1}{2} \times 10 \times(2 \times 8-1)

S8=5×15\mathbf{S}_{8}=5 \times 15

ΔU=0.4×10×5×15\Delta \mathrm{U}=0.4 \times 10 \times 5 \times 15

ΔU=20×15=300\Delta \mathrm{U}=20 \times 15=300

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