anything shot up with that initial velocity. There isn't anything in specific.
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Acceleration of the arrow is -3m/s2A = (velocity minus initial velocity) / time
If the initial velocity is 50 meters per second and the launch angle is 15 degrees what is the maximum height? Explain.
Initial velocity can be measured in the same units as any other velocity. In SI, that would be meters per second, but often km / hour are used, or (in a minority of countries) feet/second or miles/hour.
Use the formula a = v2 / r, with v = velocity (speed, actually) in meters/second, r = radius in meters. The answer will be in meters per square second.
It means that the object's speed is always 5 meters per second faster than it was one second earlier.