Momentum of pebble.
0.02kg(15m/s)=0.3kg m/s
Momentum of large rock
20kg(1m/s)=20kg m/s
As you can see, the large rock is moving much slower, but it has a lot more momentum.
6.) A
kg m/s
7.) The word instantaneous means how something is at a given point in time. Therefore instantaneous momentum is based upon one moment in time.
True
8.) Well, there is two answers for this. Technically, due to air resistance and stuff like that, an objects velocity will decrease over time, and therefore decrease its momentum.
However, in your curriculum, you might be assuming that there is not friction or air resistance.
You would have to ask your teacher
9.) Kind of a weird question...
Im not sure why color is an answer for 2, but...
Once again I dont really know, my guess would be none of the above, as none of the answers really make sense.
10.)
True, because an elephant standing still would have 0 momentum, because its velocity is 0.
Ps I would really appreciate if you made this best answer, because this took me a while to do haha.
Thanks =)