#1 A ball is thrown upward with an initial velocity of 14 m/s. Using the approxi
ID: 2225919 • Letter: #
Question
#1 A ball is thrown upward with an initial velocity of 14 m/s. Using the approximate value of g = 10 m/s2, what are the magnitude and direction of the ball's velocity at the following times? (a) 1.05 s after it is thrown m/s downward upward (b) 2.00 s after it is thrown m/s downward upward --------------------------------------------------------------------------------------------------------------------------------------------------------------------- #2 A ball rolls off a table with a horizontal velocity of 5 m/s. Is this velocity an important factor in determining the time that it takes for the ball to hit the floor? Yes No Explain. --------------------------------------------------------------------------------------------------------------------------------------------------------------------- #3 In the projectile lab, you viewed horizontal and vertical velocities for a projectile. In which situation(s) was the horizontal velocity changed? (check all that apply) a) When the object was falling b) None of these c) When the object was at it's peak d) When the object was rising --------------------------------------------------------------------------------------------------------------------------------------------------------------------- #4 The hang-time of a basketball player who jumps a vertical distance of 1 feet (0.30 m) is about 0.50 second. What will be the hang-time if the player reaches the same height while jumping 6 feet (1.83 m) horizontally? ______________ s --------------------------------------------------------------------------------------------------------------------------------------------------------------------- #5 In a new action movie, villains drop a bag of gold from a moving helicopter into the backseat of a convertible driving below. To film the scene, the helicopter pilot has practiced so that she can stay 20Explanation / Answer
u = 14 m/s
g = 10 m/s*s
A). V = u + at = 14 - 10*1.05 = 14 - 10.5 = 3.5 m/s in upward direction
B) V = u + at = 14 - 10*2 = 14 - 20 = -6 m/s
means velocity of ball is 6m/s in downward direction
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