The final speed of the object is 11.2m/s.
To find the answer, we need to know about the Newton's equation of motion.
What's the Newton's equation of motion that establish a relation between initial velocity, final velocity, acceleration and distance?
- The Newton's equation of motion is V²-U²= 2aS
- U = initial velocity, V= final velocity, a= acceleration and S = distance.
What's the final velocity, if initial velocity, acceleration and distance are 1m/s, 9 m/s² and 7m respectively?
- Here, U= 1m/s, a= 9 m/s² and S= 7m
- V²- 1²= 2×9×7= 126
V= √126= 11.2 m/s
Thus, we can conclude that the final speed is 11.2 m/s.
Learn more about the Newton's equation of motion here:
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