Asoccer ball is kicked; it comes to rest after rolling through the grass. why is this not considered a violation of newton's first law?

The ball was put in motion by the kick (an external force). The fact that it failed to continue in a uniform motion is due to (again) an external force acting on it. This time it is the force of friction. The ball rolling through grass hitting small obstacles can be, in aggregate, represented by a force acting against its direction of motion. This force exists until the ball stops. So, Newton's doing fine.

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg