1.
A bullet is fired from a gun at the speed of 280m/s280\,\text{m/s} in the direction 3030^\circ above the horizontal. The maximum height attained by the bullet is (g=9.8m/s2,  sin30=0.5)(g = 9.8\,\text{m/s}^2,\; \sin 30^\circ = 0.5):