A 3.0 kg puck slides due east on a horizontal frictionless surface at a constant speed of 4.5 m/s. Then a force of magnitude 6.0 N, directed due north, is applied for 1.5 s. Afterward, 

a. What is the northward component of the puck's velocity? 

A. 0.50 m/s 

B. 2.0 m/s 

C. 3.0 m/s 

D. 4.0 m/s 

E. 4.5 m/s 

b. What is the speed of the puck? 

A. 4.9 m/s 

B. 5.4 m/s 

D. 7.5 m/s 

C. 6.2 m/s 

E. 11 m/s