Ask a New Question

Question

​ A 3-kg stone is dropped from a height of 100 m.  Find its kinetic and potential energies when it is 50 m from the ground.
 
13 years ago

Answers

Henry
PE = mgh = 3 * 9.8 * 100 = 2940 J.

Vf^2 = Vo^2 + 2g*d,
Vf^2 = 0 + 19.6*50 = 980,
Vf = 31.3 m/s.

KE = 0.5m*V2 = 1.5*(31.3)^2 = 1470 J.

PE = 2940 - 1470 = 1470 Joules.
13 years ago
Jessica
Where did you get the 19.6 from?

Also what formula are you using? The Vf^2 = Vo^2 + 2g*d....i've never seen that before
13 years ago

Related Questions

A stone is dropped into a river from a bridge 43.9 m above the water. Another stone is dropped ve... A stone is dropped from the upper observation deck (the space deck) of the CN Tower, 450m above the... A stone is dropped from the edge of a roof, and hits the ground with a velocity of -145 feet per sec... A stone is dropped into a well and the sound of the splash is heard after 3.91 seconds. If the depth... A stone is dropped from the top of a tower 400 m high and at the same time another stone is project... A STONE IS DROPPED DOWN A PIT AND HITS THE BOTTOM 4.5 SECONDS LATER.CALCULATE THE DEPTH OF THE PIT. a stone is dropped from the top of a cliff. it is seen to hit the ground 3.5 seconds later. how high... A stone is dropped from the top of a cliff and hits the round below with a speed of 50m/s. Assume th... A 2kg stone is dropped from the top 20cm building. (a) what pe does it posses (b) at what height doe...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use