James and Sarah stand on a stationary cart with frictionless wheels. The total mass of the cart and riders is 130kg . At the same instant, James throws a 1.0kg ball to Sarah at 4.5m/s , while Sarah throws a 0.50kg ball to James at 1.0m/s . James

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7 May 2019

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A 2.3 kg cart is rolling across a frictionless, horizontal tracktowards a 1.5 kg cart that is initially at rest. The carts areloaded with strong magnets that cause them to attract to eachother. Thus, the speed of each cart increases. At a certain instantbefore contact the carts collide, the first cart's velocity is +4.5m/s and the second cart's is -1.9m/s.
a) What is the momentum of the system of the two carts at thisinstant?
b) What was the velocity of the first cart when the second cart wasstill at rest?

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A cart with mass 310 g moving on a frictionless linear air track atan initial speed of 1.3 m/s undergoes an elastic collision with aninitially stationary cart of unknown mass. After the collision, thefirst cart continues in its original direction at 0.54 m/s.

(a) What is the mass of the second cart?
(b) What is its speed after impact?
(c) What is the speed of the two-cart center of mass?

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James and Sarah stand on a stationary cart with frictionless wheels. The total mass of the cart and riders is 130kg . At the same instant, James throws a 1.0kg ball to Sarah at 4.5m/s , while Sarah throws a 0.50kg ball to James at 1.0m/s . James

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