Vertical component of velocity = 16sin(30°) = 8m/s
at the highest point of flight, the velocity of the ball is 0 (that moment when it stops before starting to fall) so:

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s=3.26m
So rounding up gives option B. (3.3m)
Answer:
200 N
Explanation:
Applying,
The force a golie must exert on the ball is,
F = ma...................... Equation 1
Where m = mass of the ball, a = acceleration of the ball.
But,
a = Δv/t............... Equation 2
Where Δv = change in velocity, t = time.
Substitute equation 2 into equation 1
F = m(Δv/t)............... Equation 3
From the question,
Given: m = 0.8 g, t = 0.1 s, Δv = 25 m/s
Substitute these values into equation 3
F = 0.8×25/0.1
F = 200 N
The answer is is 730.5 days rounded, so A. 730