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A boy pushes a box of mass 2 kg with a force F = (20i + 10j) N on a frictionless surface. If the box was initially at rest, then displacement along the x-axis after 10 s is ____ m.

1. 100
2. 200
3. 250
4. 500

Correct answer: 500

Solution

a_x = 20/2 = 10 m/s^2. Starting from rest, x = (1/2)(10)(10)^2 = 500 m.

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