What is the role of MnO2 in a dry cell?

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.

Name two kinds of practical electric pumps.

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m