A body is projected at t 0 with a velocity 10 ms-¹ at an angle of 60° with the horizontal. The radius of curvature of its trajectory at t = 1s is R. Neglecting air resistance and taking acceleration due to gravity g 10 ms-²the value of R is :
A. 2.5m
B. 10.3m
C. 2.8m
D. 5.1m