Register to reply

Throwing a dart from a roof - Velocity

by mybrohshi5
Tags: dart, roof, throwing, velocity
Share this thread:
mybrohshi5
#1
May8-10, 05:43 PM
P: 365
1. The problem statement, all variables and given/known data

A dart is thrown horizontally from a buildings rooftop. The dart's time of flight is 2.0 s. The dart sticks in the ground such that it makes a 53.1 degree angle with the ground.

With what speed was the dart thrown?


3. The attempt at a solution

I am studying for my final and i do not get this problem from one of my previous tests.

The answer is 14.7 m/s and i have no idea how to get it. Can anyone point me in the right direction.

Thank you :)
Phys.Org News Partner Science news on Phys.org
Security CTO to detail Android Fake ID flaw at Black Hat
Huge waves measured for first time in Arctic Ocean
Mysterious molecules in space
rock.freak667
#2
May8-10, 06:10 PM
HW Helper
P: 6,205
Well if it is throw horizontally, then the initial vertical velocity is zero right? Using an equation of motion, what would be final vertical velocity when t=2?
mybrohshi5
#3
May8-10, 06:36 PM
P: 365
Is the final vertical velocity when t=2 just 19.6 m/s

I got that from

Vf = Vi + at

oh so then from that the x component of the Vf will be the same as the velocity initial correct?

so

tan(53.1) = 19.6 / Vfx

Vfx = 14.7 m/s

Does that seem right?

rock.freak667
#4
May8-10, 06:44 PM
HW Helper
P: 6,205
Throwing a dart from a roof - Velocity

Yes that looks correct.
mybrohshi5
#5
May8-10, 06:48 PM
P: 365
Yay! thank you very much :)


Register to reply

Related Discussions
A dart player, standing 3.2m away from the darboard... thorws a dart horizontally... Introductory Physics Homework 2
Solve A Question in 2D Motion A dart player throws a dart horizontally at a spee Introductory Physics Homework 4
Kinematics: Throwing ball up the building with unknown initial velocity Introductory Physics Homework 4
Velocity of throwing a ball Introductory Physics Homework 4
Throwing a ball from the roof of a building... Introductory Physics Homework 4