A 3kg ball moving at 8 m/s strikes a 2kg ball at rest, if the collision is elastic, what is the speed of the lighter ball if the heavier ball moves at 2m/s in the opposite direction

Speed of lighter ball is 4 m/s.

Explanation:

Applying the principle of conservation of linear momentum,

momentum before collision = momentum after collision.

+ = -

= 3 kg, = 8 m/s, = 2 kg, = 0 m/s ( since it is at rest), = 2 m/s, = ?

(3 x 8) + (2 x 0) = (8 x 2) - (2 x )

24 + 0 = 16 - 2

2 = 16 - 24

2 = -8

=

   = -4 m/s

This implies that the light ball moves at the speed of 4 m/s in the opposite direction of the heavier ball after collision.

terd muffin is the correct answer

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.