A cart is propelled over an xy plane with acceleration components

A cart is propelled over an xy plane with acceleration components ax = 4.9 m/s2 and
ay = -1.8 m/s2. Its initial velocity has components v0x = 8.3 m/s and v0y = 13.9 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest y coordinate?

Answer

A plane flies 400 km east from city A to city B in 45.0 min and then 990 km south from city B to city C in 1.50 h. (Assume i points east and j points north.) In magnitude-angle notation, what is the plane’s average velocity for the total trip?

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