physics
posted by pavatharani .
a stone is thrown vertically upward with an initial velocity u from the top of tower, reaches the ground with a velocity 3u. what is the height of tower?

final KE=initialPEinitial KE
1/2 m v^2=mgh1/2 m u^2
1/2m(9u^2u^2)=mgh
solve for h.
Respond to this Question
Similar Questions

Physics/Science #2
A rock is thrown verticaly upward from ground level at time t = 0. At t = 1.65 s it passes the top of a tall tower, and 0.95 s later it reaches its maximum height. What is the height of the tower? 
Math
The height(h) of an object that has been dropped or thrown in the air is given by: h(t)=4.9t^2+vt+h t=time in seconds(s) v=initial velocity in meters per second (m/s) h=initial height in meters(m) A ball is thrown vertically upwardd … 
Math
The height(H) of an object that has been dropped or thrown in the air is given by: H(t)=4.9t^2+vt+h t=time in seconds(s) v=initial velocity in meters per second (m/s) h=initial height in meters(m) H=height h=initial height I didn't … 
Math Help (URGENT X10)
This is really urgent so please please please help. The height(H) of an object that has been dropped or thrown in the air is given by: H(t)=4.9t^2+vt+h t=time in seconds(s) v=initial velocity in meters per second (m/s) h=initial height … 
Physics
A stone is thrown vertically upward from the top of the tower with a velocity of 15m / s. Two seconds later a second stone is dropped from the top of the tower.if both the stone strike the ground simultaneously find the height of the … 
mechanics
A stone is thrown vertically up from the top of the tower 40m high with the velocity of 20m/s. 3 seconds later another stone is thrown vertically up from the ground with the velocity of 30m/s.Calculate when and where the two stones … 
physics
a stone is thrown vertically upward from tower takes 5 sec to reach ground the height of tower is 
physics
A ball reaches the ground at 6 seconds when thrown vertically upwards from the top of a tower with an inoitial velocity 24m/s. Find the height of the tower. 
physics
A stone thrown upward at the top of the tower reaches the ground after 5 sec. A second stone is thrown down with the same speed and reaches ground in 3 sec. What is the height of the tower 
Physics
A stone is thrown from the top of a tower of height 60m with velocity 40m/s at an angle of 30 degree above the horizontal. Calculatethe time taken by the stone to hit the ground. At what distance from the foot of the tower the stone …