A motor is used to produce
1 answer:
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Answer:
Explanation:
Since work done is in the form of potential energy, we will use the formula of potential energy here.
We know that,
<h3>P.E. = mgh </h3>Where,
m = mass = 20 kg
g = acceleration due to gravity = 10 m/s²
h = vertical height = 20 m
So,
<h3>Work done = mgh</h3>Work done = (20)(10)(20)
Work done = 4000 joules
Work done = 4 kJ
Answer:
<em>t=3.5 seconds</em>
Explanation:
<u>Moving at Constant Speed</u>
Let's suppose and object travels in a constant direction and covers the same distances x at the same time t, we say it has a constant speed. It can be computed as:
The time taken to go through the distance x is computed by
Our shark moves at v=12 m/s and we need to compute the time it takes to swim x=42 m, so we have
It takes the shark 3.5 seconds to swim 42 m