theres two questions actually.
1) a boat increases its speed from 5.0 m/s to 7.5 m/s over a distance of 50.0m. what it the boat's acceleration?
2) within 4.0s of liftoff, a spacecraft that is uniformly accelerating straight upward from rest reaches an altitude of 4.50 x 10^2 m [up]
a) what is the spacecraft's acceleration
b)at what velocity is the spacecraft travelling when it reaches this altitude?
for 1) i just need to rearrange vf^2 = vi^2 +2aΔd to find acceleration
for 2a) the same thing but with the equation, Δd=viΔt + 1/2aΔt^2
The Attempt at a Solution
ive tried rearranging the equation but i get stuck and i dont know what to do next. please help