3) A tolley of mass 4kg, moving with a velocity of 4 m/s collides with a trolley of mass 3kg moving
with a velocity of 3 m/s in opposite direction. If both
stick together after collision, Calculate the common
velocity​

3.57 m/s

Explanation:

The sum of the 2 momentums Is equal the finale momentums. so if momentums Is q, v Is velocity and m Is Mass, q3=m1*v1+m2**v2=16+9=25 m*kg/s

q3=m3*v3

v3=q3/m3=25/(4+3)=3.57m/s

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

-4 on