Posted by **ashley** on Thursday, September 15, 2011 at 10:47pm.

A ball is thrown vertically upward with a speed of +13.0 m/s.

(a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point?

(d) What is its velocity when it returns to the level from which it started?

- physics -
**Henry**, Saturday, September 17, 2011 at 7:32pm
a. h = (Vf^2 - Vo^2) / 2g,

h = (0 - (13)^2) / -19.6 = 8.62m.

b. t(up) = (Vf - Vo) / g,

t(up) = (0 - 13) / -9.8 = 1.33s.

c. d = Vo*t + 4.9t^2 = 8.62,

13t + 4.9t^2 = 8.62,

4.9t^2 + 13t - 8.62 = 0Use Quadratic Formula to find t:

t = 0.55s.

d. Vf^2 = Vo^2 + 2gd,

Vf^2 = 0 + 2*9.8*8.62 = 168.952,

Vf = 13m/s. = Same as initial velocity

going up.

## Answer this Question

## Related Questions

- Physics - A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How ...
- physics - A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How ...
- physics - A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How ...
- physics - A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How ...
- Physics please help!!!!!!! - A ball is thrown vertically upward (assumed to be ...
- physics - a ball is thrown vertically upward with a speed 25.0m/s (a)How high ...
- Physics - A ball is thrown vertically upward with a speed of 25.0m/s.take ...
- physics - A ball is thrown vertically upward with a speed of 23.7 m/s from a ...
- Physics - A ball is thrown vertically upward with a speed of 25.0 m/s from a ...
- college - a ball is thrown vertically upward from the ground with the velocity ...