An object P of mass 4 kg moving with a velocity 4 ms-1 collides elastically with another object Q of mass 2 kg moving with a velocity 3 ms-1 towards it. Determine the total momentum before collision.

[ou.01]which of these is the most likely use of an electromagnetic wave which has wavelength shorter than microwaves but longer than visible light? o heat food safely o neat food safely o take images of bones and teeth o transmit radio and cellular phone signals o take images of bones and teeth o transmit radio and cellular phone signals o detect the location of objects which emit heat