[3] A 900 kg truck is going 45 m/s when a large mass is dropped straight down (with no horizontal velocity) in its bed. Calculate the size of the mass if the trucks velocity afterwards is 37 m/s. dropped with a velocity of 8 m/s

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!