Answer:
⇒ To find the mass, we apply the following formula:

<u>Data</u>:
➢ 
➢ 
➢ 
∴ We replace and develop:



<h2>
Body mass is 39.9 kg</h2>
Answer:
The mass of Laura and the sled combined is 887.5 kg
Explanation:
The total force due to weight of Laura and friction on the sled can be calculated as follows;

= (400 + 310) N
= 710 N
From Newton's second law of motion, "the rate of change of momentum is directly proportional to the applied force.

where;
is mass of Laura and
is mass of sled
Mass of Laura and the sled combined is calculated as follows;

given
V = Δv = 4-0 = 4m/s
t = 5 s

Therefore, the mass of Laura and the sled combined is 887.5 kg
Answer:
<em>P=mgh</em>
<em>P=mghm=55</em>
<em>P=mghm=55g=9.8 or ~10</em>
<em>P=mghm=55g=9.8 or ~10h=27</em>
Explanation:
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Explanation:
Relation between work and change in kinetic energy is as follows.

Also, 
=
J
=
J
Let us assume that electric force on the electron has a magnitude F. The electron moves at a distance of 0.3 m opposite to the direction of the force so that work done is as follows.
w = -Fd

F =
Therefore, relation between electric field and force is as follows.
E = 
= 
=
C
Thus, we can conclude that magnitude of the electric field that will stop these electrons in a distance of 0.3 m is
C.