Answer:
(a)
(b) It is moving at 14 m/s.
Explanation:
(a)
Given:
The energy, , of an object moving with a velocity is given as:
, where, is its mass.
Multiplying both sides by 2, we get
Now, divide both sides by
Taking square root both sides, we get
Therefore, in terms of and is given as:
(b)
Using the above formula,
Plug in 4900 joules for and 50 kg for . Solve for . This gives,
Therefore, it is moving with a speed of 14 m/s.