# Velocity/Accel question

A stone is thrown vertically upward at a speed of 25.30 m/s at time t=0. A second stone is thrown upward with the same speed 1.860 seconds later. At what time are the two stones at the same height?

what are the equations needed, and any help is greatly appreciated thanks

Related Introductory Physics Homework Help News on Phys.org

#### alphysicist

Homework Helper

A stone is thrown vertically upward at a speed of 25.30 m/s at time t=0. A second stone is thrown upward with the same speed 1.860 seconds later. At what time are the two stones at the same height?

what are the equations needed, and any help is greatly appreciated thanks
What have you tried so far?

i have tried setting them equal.
also, tried using the equation X-Xo= Vox*t + .5Ax*t^2
and Vx^2=Vox^2 + 2 Ax (x-xo)

i cant seem to be getting anything reasonable...

#### LowlyPion

Homework Helper
i have tried setting them equal.
also, tried using the equation X-Xo= Vox*t + .5Ax*t^2
and Vx^2=Vox^2 + 2 Ax (x-xo)

i cant seem to be getting anything reasonable...
How long does it take to reach max height?

Would this be given by Vo/g = t seconds?

Figure that value to decide where the first stone will be when the second is released. (If it has already hit the ground by the time you throw, then it will have already crossed before you threw it. If the first stone is dropping when you throw #2 ... it's good to know what the two are doing so you can keep things straight.

#### ritwik06

A stone is thrown vertically upward at a speed of 25.30 m/s at time t=0. A second stone is thrown upward with the same speed 1.860 seconds later. At what time are the two stones at the same height?

what are the equations needed, and any help is greatly appreciated thanks
Write out the time dependence of displacement for both the bodies (keep the 1.860 seconds in mind) and equate them....