zaarsmakhanz@yahoo.com

Physics
Tutor: None Selected Time limit: 1 Day

A stone of mass 2kg is dropped from a height of 50m.its K.E after two seconds will be...?
a:9.8J
b:19.6J
c:39.6J
d: none

Jul 6th, 2014

Sure - Here we will use the Kinetic Energy formula: K = .5*(mass)*(velocity)

before we to that, however, we need to determine the velocity of the object...since it is free-falling, then it's velocity after 2 seconds will be: v=gt = (9.81)*(2) = 19.62 m/s

Back to out KE equation: K = .5*2*19.62 = 19.62 J

The answer is b.

I'm quite proficient in physics.  Please feel free to contact me directly for assistance in the future.  Thanks.

Jul 6th, 2014

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Jul 6th, 2014
...
Jul 6th, 2014
Dec 11th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer