Multiple Choice
Free fall: A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 
if air resistance is negligible. The time when the ball strikes the ground is closest to
A) 9.4 s
B) 9.0 s
C) 8.7 s
D) 9.7 s
E) 10 s
Correct Answer:
Verified
Correct Answer:
Verified
Q14: Free fall: Two objects are thrown from
Q15: Basic kinematics variables using calculus: The acceleration
Q16: Basic kinematics variables: The figure represents the
Q17: Free fall: A ball is thrown directly
Q18: Free fall: On the earth, when an
Q20: Constant acceleration: A car starts from rest
Q21: Basic kinematics variables: The figure shows the
Q22: Free fall: A package is dropped from
Q23: Free fall: To determine the height of
Q24: Basic kinematics variables: If an object is