Answer:
The minimum speed is 7.5 m/s.
Explanation:
Given that,
Height = 2.87 m
We need to calculate the minimum speed
Using equation of motion


Where, u = minimum velocity
g = acceleration due to gravity
h = height
Put the value into the formula


Hence, The minimum speed is 7.5 m/s.
D. Energy that is transformed is neither destroyed nor created
Answer:
350 ft/s²
Explanation:
First, convert mph to ft/s.
58 mi/hr × (5280 ft/mi) × (1 hr / 3600 s) = 85.1 ft/s
Given:
v₀ = 85.1 ft/s
v = 0 ft/s
t = 0.24 s
Find: a
v = at + v₀
a = (v − v₀) / t
a = (0 ft/s − 85.1 ft/s) / 0.24 s
a = -354 ft/s²
Rounded to two significant figures, the magnitude of the acceleration is 350 ft/s².