Final answer:
The value of time (t) in the equation -9.8t + 49 = 0 is 5 seconds.
Step-by-step explanation:
To solve the equation -9.8t + 49 = 0, we can rewrite it as -9.8t = -49. To isolate t, we divide both sides by -9.8, which gives us t = -49 / -9.8. Simplifying, we find that t = 5s. Therefore, the value of time (t) is 5 seconds.