# physics

posted by .

A diver is jumping straight up with 2 m/s from a 15 meter platform. Calculate the maximum height of the diver, the diver’s velocity when reaches the water, and total time to reach the water.

• physics -

max height: new PE=initial KE
mgh=1/2 mv^2
h= 1/2 v^2/g

velocity at impact
KE at impact= PE lost+ initial KE
1/2 m v^2= mg(15)+1/2 m 2^2
solve for v.

Total time.
hf=hi+vi*t - 4.8t^2
0=15+2t-4.8t^2

• physics -

Thanks bobpursely I need this for my Quantitative Biomechanics class

## Similar Questions

1. ### Physics

An Olympic diver performs a dive from the 10 m platform and achieves a speed of 14 m/s just before entering the water. Neglecting air friction, approximately how many times larger the diver’s speed than the diver would have achieved …
2. ### math

Diver jump from cliff at heights of 85 to 115 feet above the water. After t seconds, a diver has fallen 16t2 feet. Does a diver jumping from a height of 85 feet reach the surface of the water within 2 seconds?
3. ### math

A diver jumps into a 10 meter deep pool from a 5 meter platform with an initial upward velocity of 3.2 meters per second. What will the divers maximum height be?
4. ### physics

A diver with a mass of 51 kg reaches a maximum height of 5.8 m above the water. When the diver has fallen 2.8 m from the apex, what is her kinetic energy (J)?
5. ### physics- energy and work

A 47.6-kg diver steps off a 10.82 m high diving board and drops straight down into the water. If the diver comes to rest 5.3 m below the surface of the water, determine the average resistance force exerted on the diver by the water. …
6. ### Physics

A diver running 1.8 m/s dives out horizontally from the edge of the cliff and 3 s later he reaches the water below. (a) Calculate the resultant velocity (with direction) of the diver just before he hits the water. (10) (b) How high …
7. ### math

a diver jumps from a platform at time t=0 seconds. the distance of the diver above water level at time t is given by s(t)=-4.9t^2 +4.9t+10, where s is in meters c.) find when velocity equal zero. find the maximum height of the diver …
8. ### Algebra

A high diver is standing on a platform above a pool. Her diving path can be modeled by the function h(t)=-16t^2+8t+12, where h is her height in feet above the water and t is time in seconds. a) How high is the platform (initial height …