Vf = v0 + at
xf= x0 + v0t + 1/2at^2
v^2f = v^20 +2a (xf - x0)
1. using equation (1) solve for t given that v0 = 5 m/s, vf = 25 m/s, and a = 10 m/s2.
2. given v0 = 0 m/s, x0 = 0 m and t = 10 s, use all three equations together to find xf .
3. a = 10 m/s2, x0 = 0 m, xf = 120 m, and v0 = 20 m/s. use the second equation to find t.
4. vf = - v0 and a = 2 m/s2. use the first equation to find t / 2.
5. how does each equation simplify when a = 0 m/s2 and x0 = 0 m?

Explanation:

1., 3., 4., and 5. all tell you exactly what to do and give you the values to do it, so I'm not sure what your issue for those. It's plug and chug for those four.

As for 2., something is missing here... I've tried several different ways of combining the three equations (which is what you would do there) but can't get any values out of it without knowing either V_f or acceleration. Double check your original question to see if you might have missed a given variable and update us on it.

Edit: Or maybe they want you to answer with variables? I don't think that's the case though; because why give a value for time if that's what they're looking for...

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the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia