13. A 1 kg mass and 2 kg mass are connected by a string and pass over a smooth pulley as
shown in figure then

i) The acceleration of mass is
(a) 4.66 m/s?
(b) 5.66 m/s?
(c) 6.66 m/s?
(d) 8.76 m/s?
ii) The tension on string is
(a) 8.68 N
(b) 10.68 N
(c) 12.68 N (d) 20.68 N​

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.