How fast is a ball rolling if it contains 98 j of kinetic energy and has a mass of 4kg
1 answer:
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The gravitational potential energy U is defined as the product of mass m, the acceleration of gravity g and the height of object h.
We do not have the mass of the hiker. But we know that its W weight is:
Where
So:
.
So:
J
The hiker has gained 30,000 J of energy
Answer:
The correct answer will be:
(a) 27.3 m/s
(b) 3.8 s
Explanation:
According to the question:
Acceleration,
Time,
(a)
The gazelles top speed will be:
⇒
or,
(b)
As we know,
s = 30 m
Now,
⇒
or,
⇒
On putting the given values, we get
or,