Please help me! Which chemical equation follows the law of conservation of mass?
A. 2LIOH + H2CO3 Li2CO3 + H20
B. 2LIOH + H2CO3 → Li2CO3 + 2H20
O C. LiOH + H2CO3 → Li2CO3 + 2H20
O D. 2LIOH + H2CO3 → LICO3 + 2H20

A6.0-kilogram cart initially traveling at 4.0 meters per second east accelerates uniformly at 0.50 meter per second squared east for 3.0 seconds. what is the speed of the cart at the end of this 3.0 second interval? (1) 1.5 m/s (3) 3.0 m/s (2) 5.5 m/s (4) 7.0 m/s