The speed of the ball 0.60 seconds after it is released is 6.8 m/s.
Newton's law of motion is given by:
v = u + gt
where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity and t is the time.
Given that:
u = 0.8 m/s, g = 10 m/s², t = 0.6s. Hence:
v = 0.8 + 10(0.6)
v = 6.8 m/s
Therefore the speed of the ball 0.60 seconds after it is released is 6.8 m/s.
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All of these seem like reasonable answers, but I myself would go with A :)
Oh really ? I hope your doing better my friend
Answer:
After 9 more minutes, her cell battery will be 80% charged.
Explanation:
Let us try to make an equation here to describe the relation between battery and time.
It is given that the battery charges at a constant rate so we can assume that
battery(
) ∝ Time(
)

But at t=0, the battery is already 30% charged so we rewrite the equation as follows:
-(1)
Now,
at put t=36 and b=70 in Eqn 1:
We get 
The final eqn is 
Put b=80
We get:

∴ It will take (45-36)=9 more minutes to reach 80% battery.
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