An 80 - kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15m/s. Sort the following quantities as known or unknown. Take the horizontal direction to be along the x axis. : the mass of the quarterback, : the mass of the football, : the horizontal velocity of quarterback before throwing the ball, : the horizontal velocity of football before being thrown, : the horizontal velocity of quarterback after throwing the ball, : the horizontal velocity of football after being thrown
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