79. a commuter train can minimize the time t between
two stations by accelerating (a, = 0.1 m/s2) for a time
tį then undergoing a negative acceleration (az =
-0.5 m/s2) by using his brakes for a time ty. since the
stations are only 1 km apart, the train never reaches its
maximum velocity. find the minimum time of travelt,
and the time t.

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.

uranium fissions/breaks up giving out energy and neutrons

a straight line sloped