## anonymous 5 years ago a man drops a ball downside from the roof of a tower of height 400 meters.At the same time another ball is thrown upside with a velocity 50 m/s from the surface of the tower,find when and at which height from the surface of the tower the two balls meet together. please help having test tomorrow and cant find answer to this question

1. anonymous

2. anonymous

Assume the event happens at time=t and at a distance x from the origin... Take good care of the axis drawn...

3. anonymous

Case A: Ball dropped downwards initial vel., v0=0m/s accl, a=-g=-9.8m/s^2 displacement, S=(x-400) m Then we have S=v0*t+0.5a*t^2 x-400= -0.5*9.8*t^2

4. anonymous

Case B: Ball thrown upwards initial vel., v0=50m/s accl, a=-g=-9.8m/s^2 displacement, S=(x-400) m Then we have S=v0*t+0.5a*t^2 x-400= 50*t-0.5*9.8*t^2

5. anonymous

We have 2 eqns: \[(x-400)=-0.5*9.8*t^2 \] \[(x-400)=50*t-0.5*9.8*t^2 \] Solving, we get t=0 & x=400 This is the initial state.... which means that they never meet during the flight...

6. anonymous

where did u get the image from?

7. anonymous

i drew it... using open office draw...