Wednesday

April 16, 2014

April 16, 2014

Posted by **josephz** on Friday, September 21, 2012 at 12:27am.

(a) What was the initial velocity (magnitude and direction) of the rock?

(b) What was the magnitude of the velocity of the rock just before impact with the ground?

- Physics -
**drwls**, Friday, September 21, 2012 at 1:17am(a) They have already told you that the initial rock direction was vertical (up).

y = 500 + Vo*t - 16.1 t^2

= 0 then t = 6.5

0 = 500 + 6.5*Vo - 16.1*(6.5)^2

Solve for Vo.

V(t) = Vo - 16.1 t

Substitute t = 6.5 s and solve for V at that time.

The number 16.1 is the value of g/2, in units of ft/s^2

**Related Questions**

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

physics - A small rock is thrown vertically upward with a speed of 13.0 from the...

Physics - A small rock is thrown vertically upward with a speed of 13.0 m/s from...

Physics - A rock is thrown vertically with a velocity of 21 m/s from the edge of...

physics - A small rock is thrown vertically upward with a speed of 13.0from the ...

Physics - Example 1: (Rock A) is thrown against a larger stationary rock(Rock B...

physics - A rock is thrown vertically upward with a speed of 14.0 m/s from the ...

science - A rock is thrown vertically upward with an initial speed of 100 ft/s. ...

physics - A rock is thrown upwards from the top of a 100m cliff, on the way down...