A lorry of mass 1000 kg moves at a velocity of 5.0 m/s. It collides with a car of mass 800 kg moving at a velocity of 2.0 m/s in the same direction. If the lorry moves at a velocity of 3.4m/s in the same direction after the collision, calculate the velocity of the car

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

scientific laws are the result of testing theories and proving them to be facts.

b.a device that inputs heat into a cool object

i think the answer would be reserve.