Help me plz.
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This question is a good example of the difference between 'speed' and 'velocity'.  This one is all 'velocity', and you've absolutely gotta keep the directions straight.

The object started out moving forward at 10 m/s.  It ended up moving backward at 2 m/s.  What was the change in its velocity ?

The change was 12 m/s backward !  

Momentum = (mass) x (velocity).

Change in momentum = (mass) x (change in velocity)

This change in momentum = (0.1 kg) x (12 m/s backward)

This change in momentum = 1.2 m/s backward  or  1.2 Ns  (B)

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

newton's first law of motion