What height will a dart achieve 7 seconds after being blown straight up at 50 m/s?
It is 100 m
Since this is motion in only one dimension, it is a relatively simple problem to solve.
As we're given time, acceleration and initial velocity, we can use our time dependent equation of kinematics, which is:
Now let's list out our given values:
So now all we need to do is plug in and solve:
However, we would round this down to 100 because of the 1 significant digit in our given information (if you have 50. and 7.0, you would round it to 2 sig figs, which would be 110).
Hope that helped :)