Answer:
<h2>
t=1.43 s</h2>
Option A is the correct option.
Solution,
S=10 m
u=0 m/s
a=9.8 m/s^2
Now,
<h3>
</h3>
hope this helps...
Good luck on your assignment...
Explanation:
The initial kinetic energy 
for both blocks is zero. Let 
and 
. So using the conservation law of linear momentum, we can write
or
The final kinetic energies for the two masses are
Therefore, the ratio of their kinetic energies is
By using vector
a. the distance traveled is 12 kilometres
b. the resultant displacement is (7 i + 5 j) kilometres
We need to know about vectors to solve this problem. Vector has magnitude and also direction. Displacement is included in vector. It can be written as
s = sx i + sy j + sz k
where s is displacement, sx is displacement on x-axis, sy is displacement on y-axis and sz us displacement on z-axis.
From the question above, we know that
east = positive x
south = negative y
west = negative x
north = positive y
s1 = 7 j
s2 = 5 j
The distance traveled is
s = s1 + s2
s = 7 + 5
s = 12 kilometres
The resultant displacement is
s = s1 + s2
s = 7 i + 5 j
s = (7 i + 5 j) kilometres
Find more on vector at: brainly.com/question/25811261
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