Answer:
a)KE=878.8 J
b)W=2636.4 J
Explanation:
Given that
mass ,m = 65 kg
Initial speed ,u = 5.2 m/s
a)
We know that kinetic energy KE is given as follows
[tex]KE=\dfrac{1}{2}mu^2[/tex]
m=mass
u=velocity
Now by putting the values in the above equation we get
[tex]KE=\dfrac{1}{2}\times 65\times 5.2^2\ J[/tex]
KE=878.8 J
b)
We know that
Work done by all forces = Change in the kinetic energy
The final velocity , v= 2 u = 2 x 5.2 m/s
v= 10.4 m/s
[tex]W=\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2[/tex]
Now by putting the values in the above equation we get
[tex]W=\dfrac{1}{2}\times 65\times 10.4^2-\dfrac{1}{2}\times 65\times 5.2^2\ J[/tex]
W=2636.4 J
a)KE=878.8 J
b)W=2636.4 J
