Answer:
199.0521 Will be the answer
Answer:
An ion is an atom or group of atoms with a positive or negative charge. Ions form when atoms lose or gain electrons to obtain a full outer shell: metal atoms lose electrons to form positively charged ions non-metal atoms gain electrons to form negatively charged ions.
Explanation:
Answer:
61.0168 g/mol Explanation:
(a) 154.5 N
Let's divide the motion of the sprinter in two parts:
- In the first part, he starts with velocity u = 0 and accelerates with constant acceleration
for a total time
During this part of the motion, he covers a distance equal to
, until he finally reaches a velocity of
. We can use the following suvat equation:

which reduces to
(1)
since u = 0.
- In the second part, he continues with constant speed
, covering a distance of
in a time
. This part of the motion is a uniform motion, so we can use the equation
(2)
We also know that the total time is 10.0 s, so

Therefore substituting into the 2nd equation

From eq.(1) we find
(3)
And substituting into (2)

Solving for t,

So from (3) we find the acceleration in the first phase:
And so the average force exerted on the sprinter is

b) 14.5 m/s
The speed of the sprinter remains constant during the last 55 m of motion, so we can just use the suvat equation

where we have
u = 0
is the acceleration
is the time of the first part
Solving the equation,
