The mass of an object is 100mg. What is the object's mass in kg? Show your work

What kind of simple machine is a catapult?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km. h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.