Manuel and Sandy were partners. Sandy held the accelerometer in her hands while Manuel watched the water line. Throughout Sandys walk,
the water line remained level. What does that tell the students about
Sandy's motion?
Sandy's velocity changed when she slowed down or
sped up.
A)
Sandy's speed might have changed but her direction
B) did not.
Sandy must not have been moving if the water line
remained level
Sandy's velocity is constant: her speed and direction
did not change.
D)

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.