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Q. A base ball is being caught; its speed goes from 90 to 0 km/hr in about 0.005s. Its mass is 0.150kg. (a) What is the baseball's acceleration in m/s2 and in g's? (b) What is the size of force acting on it?

Q. A projectile is fired at an upward angle of 50° from the top of a 145m cliff with a speed of 195 m/s. What will be its speed while it strikes the ground below? (Use conservation of energy.)

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