Answer:
h = 0.46 m
Explanation:
According to the law of conservation of energy:
Potential Energy Lost by Roller Coaster = Kinetic Energy Gained by Roller Coaster

where,
h = height = ?
v = speed at bottom = 3 m/s
g = acceleration due to gravity = 9.81 m/s²
Therefore,

<u>h = 0.46 m</u>
 
        
             
        
        
        
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It's a pleasure to be helping you today with your<u> physics question!</u>
Answer:

Explanation:
We want to find the initial speed of the ball.
To do this, we have to apply the formula for the time of flight of a projectile:

where θ = angle of flight
g = acceleration due to gravity
v0 = initial speed
Therefore, substituting the given values into the formula, we have that:

⇒ 2 × ×0.8910= 9.8 × 4.2
 ×0.8910= 9.8 × 4.2
⇒

That is the initial speed of the ball.
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<em>Good Luck with your Assignment!</em>
 
        
        
        
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