William Tell shot an arrow into the air such that its original vertical velocity was 21.4 ms-1 How long would the arrow be in the air? (Hint: calculate how
long it took to reach its peak and then double it.)

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?