A passenger on a moving train tosses a coin with an initial velocity of (-2.25 m/s)x unit vector + 4.26 m/s)y unit vector (from the point of view of the passenger). The train's velocity relative to the ground is (11.5 m/s)x unit vector.

Question

(a) What is the minimum speed of the coin relative to the ground during its flight?

At what part in the coin's flight does this minimum speed occur?
choose one from the following
1. immediately after being tossed
2. at some point as it is rising
3. at the top of its motion
4. at some point at it is falling

(b) Find the initial speed and direction of the coin as seen by an observer on the ground.
( ) m/s
( ) degrees (counterclockwise from the +x axis

(c) Use the expression for ymax derived in Example 4-7 to calculate the maximum height of the coin, as seen by an observer on the ground.
( )m

(d) Repeat part (c) from the point of view of the passenger.
( )m

Please help! I don't even know where to start!