Posted by rahul patel on Monday, November 21, 2011 at 8:47pm.
the kinetic energy of moving body ids directly praportional to its mass and the square of its speed.if the mass of a bullet is halved by what factor must its speed be increased to have the same kinetic energy as before?

Math  Steve, Tuesday, November 22, 2011 at 5:41am
E = k * m * v^2
If we halve the mass, now we have
E' = k * m/2 * v^2 = E/2
In order to get E' = E, we need a new velocity, v'
E' = k * m/2 * v'^2
and we see that
v'^2 must be 2v^2
so, v' = v√2
Answer This Question
Related Questions
 Algebra II  The kinetic energy of a moving body is directly proportional to ...
 Algebra II  The kinetic energy of a moving body is directly proportional to its...
 Algebra II  The kinetic energy of a moving body is directly proportional to its...
 Physics !!!!! HELP PLEASE  A hand gun fires a 12.0 g bullet at a speed of 400 m...
 Physics  A pitcher claims he can throw a 0.157 kg baseball with as much ...
 physical science  Which of the following four bodies has the greatest kinetic ...
 Physical Science  Can someone please check these answers for me? Write T for ...
 AP physics  A 1.60g bullet, moving at 542 m/s, strikes a 0.249kg piece of ...
 physics  A 9.90g bullet has a speed of 1.33 km/s. (a) What is its kinetic ...
 physics  A 9.90g bullet has a speed of 1.33 km/s. (a) What is its kinetic ...
More Related Questions