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Q. The metal wire carries a current of 89mA, how long does it take for 13e20 electrons to pass given cross-section area anywhere along the wire? The magnitude of the charge on an electron is 1.6e-19 C
Answer in units of s.

Q. A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stationary object. This time the cart is at rest after the collision. In which collision is the impulse on the cart greater?

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