1.

A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is                     [CPMT 1997; IIT-JEE 1982]

A.             Zero                                          
B.             \[\frac{1}{\sqrt{2}}\,m/{{s}^{2}}\,N-W\]
C.             \[\frac{1}{\sqrt{2}}\,m/{{s}^{2}}\,N-E\]                                    
D.              \[\frac{1}{\sqrt{2}}\,m/{{s}^{2}}\,S-W\]
Answer» C.             \[\frac{1}{\sqrt{2}}\,m/{{s}^{2}}\,N-E\]                                    


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