Thursday

January 29, 2015

January 29, 2015

Posted by **Mbali** on Thursday, February 26, 2009 at 12:03pm.

- Physical Sciences -
**drwls**, Thursday, February 26, 2009 at 3:47pmThe time to fall, T = 4s, tells you the vertical initial velocity Vy0

-50 = Vy0 T - (1/2) gT^2

-50 = Vy0*4 - 4.9* 16 Vy0 - 78.4

4 Vy0 = 28.4

Vy0 = 7.1 m/s (upwards)

The "0" at the end of the subscript means "initial value"

For Vx, solve this equation that uses the horizontal coordinate where it hit the ground:

40 = Vx * T

Vx = 10 m/s (Vx remains the same with time, so it doesn't need a 0 subscript

The speed is sqrt[Vx^2 + Vy0^2]

and the launch angle is arctan Vy0/Vx

**Answer this Question**

**Related Questions**

Physics - A stone is thrown from a 50m high cliff and lands 5 seconds later, 40m...

Physics - A stone is thrown at an angle of 30 degrees above the horizontal from ...

Physics - A stone is thrown at an angle of 30 degrees above the horizontal from ...

physics - A ball is thrown horizontally from a cliff and hits the ground 4 ...

physics - A rock is thrown from a cliff top at 18m/s, 25 degrees above the ...

physical science - a stone is thrown horizontally at a speed of 5.o m/s from the...

Physics ?#2 - A ball is dropped from the top of a 53.0m high cliff. At the same ...

Tulane Physics - a rock is thrown unward off a cliff at a 45 degree angle. THe ...

physic - A ball is thrown toward a cliff of height h with a speed of 28m/s and ...

physics - a physics book is thrown horizontal at a velocity of 10.0m/s from the ...