Final answer:
To find v when u=9 and t=4, substitute the given values into the equation v = u + 10t and simplify.
Step-by-step explanation:
To find v when u=9 and t=4, we can substitute the given values into the equation v = u + 10t.
Substituting u=9 and t=4, we get v = 9 + 10(4).
Simplifying the equation, we have v = 9 + 40 = 49.
Therefore, when u=9 and t=4, v = 49.