What is the mass of a crate if a net force of 12 N gives the crate an acceleration of 0.20 m/s^2?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

J. j. thomson’s experiment disproved the theory that an atom