Posted by Robert C on Sunday, October 11, 2009 at 6:22pm.
A ball, dropped from rest, cover 2/7 of the distant to the ground in the last 2 seconds of its fall. From what height was the ball dropped? What was the total time of the fall?

Physics  drwls, Sunday, October 11, 2009 at 6:31pm
Let T be the total time to hit the ground.
Let H be the height it is dropped from.
H = (g/2) T^2
(5/7) H = (g/2)(T2)^2
Two equations, two unknowns. H can be eliminated easily.
(5/7)H = (5/14) g T^2
(5/7)H = (g/2)(T2)^2
Solve for T first, then solve for H
Answer This Question
Related Questions
 Math  A ball is dropped from a height of 36 feet. The quadratic equation d=1/2 ...
 algebra  A soccer ball is kicked toward the goal. The height of the ball is ...
 MATH HELP  A soccer ball is kicked toward the goal. The height of the ball is ...
 Maths  A ball is dropped from height of 100 feet towards the ground. It hits ...
 physics  a ball of mass 100g is projected vertically upwards from the ground ...
 PHYSICS  A ball thrown horizontally with speed vi = 26.0m/s travels a ...
 physics  two balls are dropped to the ground from different heights. one ball ...
 physics  A wrecking ball is hanging at rest from a crane when suddenly the ...
 Math  Suppose an object is dropped from a height h0 above the ground. Then its ...
 Physics  A ball is dropped from rest and takes 0.43 s to fall to the floor. At ...
More Related Questions