Posted by James on Friday, June 1, 2012 at 10:11pm.
Suppose you throw a 0.054kg ball with a speed of 11.5 m/s and at an angle of 31.8° above the horizontal from a building 13.1 m high.
(a) What will be its kinetic energy when it hits the ground?
(b) What will be its speed when it hits the ground?

Physics  Delbarre, Saturday, June 2, 2012 at 2:10am
conservation of energy
mgh + (1/2)m(Vi)² = (1/2)m(Vf)²
2(gh + (1/2)(Vi)²) = (Vf)²
square root( 2gh +(Vi)²) = (Vf)
square root( 256.76 + 132,25) = (Vf)
square root( 389,01) = (Vf)
square root( 389,01) = (Vf)
19.7m/s = Vf
your kinetic energy is
(0.5)(0.054)(19.7)² = 10.5 J
enjoy the answer
Answer This Question
Related Questions
 Physics  Suppose you throw a 0.058kg ball with a speed of 11.0 m/s and at an ...
 physics  You throw a 1kg ball out of a window 12 meters above the ground with ...
 physics  You throw a 1kg ball out of a window 12 meters above the ground with ...
 physics  You throw a 1kg ball out of a window 12 meters above the ground with ...
 physics  A child throws a ball with an initial speed of 8 m/s at an angle of 40...
 physics  A ball is thrown from the top of a building upward at an angle of 66...
 physics  A spring loaded gun is used to shoot a 1.3 kg ball from a rooftop. ...
 Physics  Hypothetically, you are standing on the balcony of an apartment on the...
 Physics  HELP PLEASE. Hypothetically, you are standing on the balcony of an ...
 physics  HELP ASAP!  A 3.60 kg ball is dropped from the roof of a building 184...
More Related Questions