Posted by **Chan** on Wednesday, September 23, 2009 at 3:36am.

A ball is thrown vertically upward with a speed of +12.0m/s.

A. how long the ball take to hit the ground after it reaches it highest point?

B. What is its velocity when it returns to the level from with it started?

- Physic -
**Chan**, Wednesday, September 23, 2009 at 3:52am
A tortoise can run with a speed of 0.12m/s and a hare can run 20 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.0 minutes. The tortoise wins by a shell(25cm).

A. how long does the race takes?

B. What is the length of race?

- Physic -
**drwls**, Wednesday, September 23, 2009 at 6:46am
Please post one question at a time.

The speed when the ball hits the ground will again be 12 m/s (because of conservation of energy), but the direction will be reversed, making it -12.0 m/s.

The time of flight AFTER reaching max height will be the time it takes to accelerate to a speed of 12 m/s, which is 12/g = 12/9.8 s.

- Physic -
**Taylor**, Wednesday, September 14, 2011 at 10:44pm
A tortoise can run with a speed of 13.0 cm/s, and a hare can run 20 times as fast. In a race, they both start at the same time, but the hare stops to rest for 5.0 minutes. The tortoise wins by a shell (40 cm).

(a) How long does the race take?

s

(b) What is the length of the race?

m

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