# physics

posted by .

A person jumps off a diving board 4.6 m above the water's surface into a deep pool. The person's downward motion stops 1.6 m below the surface of the water. Estimate the average deceleration (magnitude) of the person while under the water.

• physics -

since v = at
and s = 1/2 at^2
v = sqrt(2as)

the velocity increases till s = 4.6, then decreases till s = -1.6

-2*9.8*4.6 + 2*a*1.6 = 0
a = 28.175m/s^2

## Similar Questions

1. ### physics

A person jumps off a diving board 4.3 above the water's surface into a deep pool. The person's downward motion stops 2.1 below the surface of the water.
2. ### Math - solving quadratic equations with factoring

A person jumps off a 20m high cliff into water below. The height of the person above the ground at time t seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?
3. ### math

a diving board is 4 feet above a pool that is 15 feet deep. The total length of a person's dive is 10 feet. How many feet below the surfac of the water did the person dive
4. ### Math

A person jumps off a 20m high cliff into the water below. The height of the person above the ground at t time seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?
5. ### algegra

a person jumps off of a 6 foot high diving board with an initial velocity of 13 feet per second. how many seconds does it take the person to hit the water?
6. ### physics

A 53.0-kg person jumps from rest off a 12.0-m-high tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts …
7. ### physics

An swimmer of mass m is at a swimming pool. She climbs the steps to the diving board 4.0 m above the water. She jumps off the board, which enables her to rise a further 0.7 m before she begins her descent into the pool. At what speed …
8. ### Physics

At the local swimming pool, the diving board is elevated h = 7.5 m above the pool surface and overhangs the pool edge by L = 2 m. A diver runs horizontally along the diving board with a speed of v0 = 3.4 m/s and then falls into the …
9. ### Physics

A 80.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1320 N. If the diver comes to rest 5.1 m below the water's surface, what is the total distance between …
10. ### Physics

A 55.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 5.6 m below the water's surface, what is the total distance between …

More Similar Questions