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Sagot :
Hi there!
We can use IMPULSE to solve.
Recall impulse:
[tex]I = \Delta p = m\Delta v = m(v_f - v_i)[/tex]
Begin by calculating the impulse. Assuming up to be the + direction, and down to be the - direction.
[tex]I = 68(11 - (-14)) = 68 \cdot 25 = 1700 kg\frac{m}{s}[/tex]
Now, we can calculate force using this value:
[tex]I = F \cdot t\\\\F = \frac{I}{t}\\\\F = \frac{1700}{0.85} = \boxed{2000 N}[/tex]
The weight experiences a net force of 2000N UPWARDS.
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