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A stunt performer is to run and dive off...

A stunt performer is to run and dive off a tall platform and land in a net in the back of a truck below. Originally the truck is directly under the plateform, it starts forward with a constant acceleration a at the same instant the performer leaves the plateform. If the platform is H above the net in the truck, then the horizontal velocity u that the performer must have as he leaves the platform is -

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