One Dimension Free-Fall Problem

AI Thread Summary
Hugh throws a ball upwards to hit Sue, who is 7.2 meters above him, timing it to reach her one second after passing her. The initial velocity (Vo) calculated by some participants is 16.66 m/s, but this value does not satisfy the position equation when tested. There is confusion among users regarding the calculations and the correct application of equations. Participants are seeking clarity and assistance to resolve the discrepancies in their findings. The discussion highlights the challenges in solving the free-fall problem accurately.
CinciBCAT34
Messages
6
Reaction score
0
5. Sue is watching Hugh 7.2 meters below her when she sees him throw a ball up to hit her. She pulls in her head, but Hugh purposely threw the ball hard enough to hit her on his way down 1 second after it passes her on the way up. Explain how hugh figured this out...

I used a sort of system of equations...but it is comin out to 16.66 as the Vo, but when i plug it into the equation, it doesn't fit the other times
 
Physics news on Phys.org
come on ya'll, i need some real help
 
woah EASYYYY on the help
 
this is the best help site EVVAR
 
everyone keep viewing and not helping, i keep gettin 16.66, EVERY WAY I TRY, but that doesn't fit the position equation correctly
 
16.66 for the initial velocity BY THE WAY
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Help with a confusing free-fall motion physics problem?
Replies
1
Views
2K
Two balls, dropped with a delay of ##\Delta t##, meet after rebound
Replies
34
Views
2K
Understanding the Free Fall Velocity Equation
Replies
6
Views
2K
What is the spring constant for the bungee cord used in the given scenario?
Replies
4
Views
2K
How high will UT bounce on a bungee jump from the Golden Gate Bridge?
Replies
6
Views
2K
Ball Release and Thrown to reach ground at the same time
Replies
1
Views
2K
Calculating Initial Velocity of a Thrown Object Using Free-fall Equations
Replies
23
Views
3K
Theoretical description about free fall and acceleration
Replies
3
Views
2K
How Fast Must a Superhero Accelerate to Catch a Free-Falling Person?
Replies
4
Views
1K
Kinematics Question: Falling object
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top