A plank with a box on it at one end is gradually raised about the other end. As the angle of inc... VIDEO
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches \( 30^{\circ} \), the box starts to slip and slides \( 4.0 \mathrm{~m} \) down the plank in \( 4.0 \mathrm{~s} \).https://bit.ly/YTAI_PWAP https://www.pw.live
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