please solve these problems step by step , will be really appreciated.

11 An ice skater is gliding along at 2.5 mfsmls , when she undergoes an acceleration of magnitude 1.2 mfszrnlsl! for 3]] ss. Alter that she's moving at 5.1 mfsmls Find the angle between her acceleration vector and her in ilial velocity vector. 12 An object is moving in the locidirection at 1.5 mfsrnls when it undergoes an acceleration a* =.42j\"mfszar=l].42i\"mls2. Find its velocity vector after 5.!) sec. 13 The position of an object as a function of time is re ={r+={3.2t+t+ 1.2 1:2]i"+[t2}i+[1.Ttt 1.5 t2]j\"n1t2]j\"m_ where tt is the time in seconds. Find the object's magnitude of the acceleration, What is the direction of the acceleration? 14 A ock of geese is attempting to migrate due south: but the wind is blowing from the west at 5.3 mfsrnls lithe birds can y at T4 mfsrnls relative to the air, what direction should they head'? 15 An arrow red horizontallyr at 45 mfsrnls travels 24 mm horizontally, before landing on the ground. From what height above the ground was it tired