Answers: 1
![F = m*a\\20000 = 800*a\\a = 20000/800\\a = 25 [m/s^2]](/tpl/images/0512/3344/9c65e.png)
![v_{f} ^{2} =v_{o} ^{2}+2*a*dx\\ v_{o} = initial velocity = 0\\a = acceleration = 25[m/s^2]\\dx= displacement = 10[m]\\](/tpl/images/0512/3344/d9ae6.png)
![v_{f} =\sqrt{2*25*10} \\v_{f} =22.36[m/s]](/tpl/images/0512/3344/03089.png)
![E_{k}=W =0.5*m*v_{f}^{2} \\200000=0.5*800*v_{f}^{2}\\v_{f}=\sqrt{\frac{200000}{0.5*800} } \\v_{f}=22.36[m/s]](/tpl/images/0512/3344/6e95c.png)
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