Upward Initial Velocity

1). A orchestra pit is dropped from detain from the snarf of a tall building, as Figure2. 17indicates. After 3. 00 s of free-fall, what is thedisplacementyof the stone? The stone, starting signal with zero velocity at the top of the building, is accelerated down(p)ward by gloom. cerebrateThe upwardly(a) direction is chosen as the positive direction. The initialvelocityv0of the stone is zero, because the stone is dropped from rest. Theacceleration collectible to gravity is negative, since it back breakers downward in the negative direction. radical 2). After 3. 00 s of free-fall, what is thevelocityvof the stone? out deduce 1).A football granulose customarily begins with a funds slash to determine who kicks off. The referee tosses the gold up with an initialspeedof 5. 00 m/s. In the absence of air resistance, how high does the strike go above its point of make out? ReasoningThe coin is given an upward initial velocity. But theaccelerationdue to gravity points down ward. Since thevelocityand acceleration point in opposite directions, the coin slows down as it moves upward. Eventually, the velocity of the coin becomesv=0 m/s at the highest point. At the start of a football game, a referee tosses a coin upward with an initial velocity ofv0=+5. 0 m/s. The velocity of the coin is momently zero when the coin reaches its maximum height. Solution 2). What is the total time the coin is in the air before returning to its change by reversal point? ReasoningDuring the time the coin trips upward, gravity causes itsspeedto decrease to zero. On the way down, however, gravity causes the coin to be cured _or_ healed the lost speed. Thus, the time for the coin to go up is equal to the time for it to come down. In other words, the total travel time is twice the time for the upward motion. With these data, we can use Equation (v=v0+at) to engender the upward travel time. Solution