Moderate -0.8 This is a straightforward application of the work-energy principle requiring only two steps: calculate initial gravitational PE (mgh = 0.6×10×8 = 48J), calculate final KE (½mv² = 0.5×0.6×100 = 30J), then find the difference (18J). The question directly provides all needed values and requires only standard formula recall with no problem-solving insight or conceptual difficulty.
1 A particle of mass 0.6 kg is dropped from a height of 8 m above the ground. The speed of the particle at the instant before hitting the ground is \(10 \mathrm {~m} \mathrm {~s} ^ { - 1 }\). Find the work done against air resistance.
1 A particle of mass 0.6 kg is dropped from a height of 8 m above the ground. The speed of the particle at the instant before hitting the ground is $10 \mathrm {~m} \mathrm {~s} ^ { - 1 }$. Find the work done against air resistance.\\
\hfill \mbox{\textit{CAIE M1 2017 Q1 [3]}}