Answer:
28.9 m/s
4.52 s
Step-by-step explanation:
Given in the y direction:
s = 25 m
u = U sin 50°
v = 0 m/s
a = -9.8 m/s²
Find: U
v² = u² + 2as
0² = (U sin 50°)² + 2 (-9.8) (25)
U = 28.9 m/s
Given in the y direction:
s = 0 m
u = 28.9 sin 50° = 22.1 m/s
a = -9.8 m/s²
Find: t
s = ut + ½ at²
0 = (22.1) t + ½ (-9.8) t²
t = 4.52 s