A body is moving with velocity `30 m//s` towards east. After `10 s` its velocity becomes `40 m//s` towards north. The average acceleration of the body is.

Options

A. `1 m//s^(2)`
B. `7 m//s^(2)`
C. `sqrt(7)m//s^(2)`
D. `5 n//s^(2)`

Answer

D

Explanation

`a_(av)=|(Deltavecv)/(Deltat)|=sqrt((30)^(2)+(40)^(2))/(10)=5m//s^(2)`