If a spinster staring from rest has acceleration of $$$5ms^{-2}$$$ during 1st 2.0s of race then her velocity after 2 s is

• A. $$$20ms^{-1}$$$
• B. $$$10ms^{-1}$$$
• C. $$$15ms^{-1}$$$
• D. $$$5ms^{-1}$$$