Physics 11 Mr. Jean September 20th, 2011.

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Presentation transcript:

Physics 11 Mr. Jean September 20th, 2011

Gravity: An object is at rest and is dropped 1 meter. The acceleration of gravity is -9.8m/s2. How long does it take to hit the ground? HINT: xf - xi = vi t + ½ (a)(t2)

Gravity: Sarah is an excellent soccer player and hasn’t told anyone. Her best move is to kick the soccer ball straight up in the air to delay the game. The soccer ball leaves her foot from the ground with a velocity of 20m/s (upwards) and reaches a maximum height of 20.4m. How long does it take for the ball to hit the ground?

In class / homework problems: A ball is dropped from the top of CN tower which is 440m above ground. The acceleration of gravity is -9.8m/s2. How long does it take for the ball to hit the ground? A golf ball is hit straight up with the initial velocity of 50m/s. This action takes place on the moon. The moon’s gravity is -3.4m/s2. How long does it take for the ball to hit the ground if the maximum height is 357.2m?