Friday

January 30, 2015

January 30, 2015

Posted by **rolan** on Wednesday, August 8, 2012 at 10:29am.

- math -
**Steve**, Wednesday, August 8, 2012 at 10:43amthe height y of the ball at time t is

y = 15 - 5t^2

The shadow's position x meters from where the ball will hit, is found by using similar triangles:

y/x = 15/(9+x)

(15 - 5t^2)/x = 15/(9+x)

dx/dt = -(9+x)/t

at t = .5, x = 99, so

dx/dt = -(9+99)/(.5) = -216 m/s

**Answer this Question**

**Related Questions**

trig - Lindsay is out one night and notices that her body casts a shadow that is...

trig - Lindsay is out one night and notices that her body casts a shadow that is...

math - a boy is walking at dusk and notices his shado from a nearby street light...

Physics - Why is it necessary to collimate the light source before using the ...

Physics - When you approach a blinking source of light, the frequency of its ...

Analytic Geometry(Math) - a person 6 ft. tall s standing near a street light so ...

Physics - Subject: Light and Geometric Optics Question: Where must a light ...

Physics - A 75 W light source consumes 75 W of electric power. Typically only ...

Math - a light shines from the top of a pole 50ft high. a ball is dropped from ...

physics - A 75 W light source consumes 75 W of electric power. Typically only ...