Norma Releases a Bowling Ball from Rest;it Rolls Down a Ramp

Multiple Choice

Norma releases a bowling ball from rest;it rolls down a ramp with constant acceleration.After half a second it has traveled 0.40 m.How far has it traveled after two seconds?

A) 3.2 m
B) 6.4 m
C) 9.0 m
D) 16 m