Explanations & Calculations
1)
- The nail falls under the constant acceleration: g until it reaches the ground. Therefore, applying S=ut+1/2at2, you can calculate the height it travels thus the height of the roof.
↓hh=0ms−1×2.5s+21×9.8ms−2×(2.5s)2=30.6m
2)
- Applying v=u+at, you can calculate the velocity with what it hits the floor.
vv=0ms−1+9.8ms−2×2.5s=24.5ms−1
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