Velocity and work?

When a body is acted upon a force of (5i^+4j^3k^) N\left(5\hat{i} + 4\hat{j} - 3\hat{k}\right)\text{ N}, it begins to move with a constant velocity of (2i^3j^7k^) m/s\left(2\hat{i} - 3\hat{j} - 7\hat{k}\right)\text{ m/s}. Find the work done(in joules) by the force after 4 seconds.

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