A cart with mass mc = 850g is rolling along a frictionless track with a speed of vci=9.00 m/s. A block is then dropped vertically onto the cart. After it is dropped onto the cart, the system has a speed of vf=6.75 m/s. a) What is the mass of the block that was dropped on the cart? b) The cart then collides with an airbag and comes to a stop in a time ∆t = 0.015s. What is the magnitude of the average force on the system during the collision with the air bag?

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