If you rearrange v=u+at, you get t=(v-u)/t
I substituted 24.76 for v, and 5 for u.
Just while typing this I realize that I should be substituting -24.76 and thus getting t=3.03.
This will thus change my answers for (a) and (b). Thanks for calling my attention to that.
I have decided to change it to make up positive and down negative now. Makes more sense to me now.
For (a) I just realized this could also have been done by using v^2=u^2+2as to find v=24.74ms^-1 and then using v=u+at, to find t, being -2.02
For (b) Using s=ut+1/2at^2 with s=5(6+2.02) I get...
I believe I solved for time wrong.
There should be a way to solve for t using the equations I listed, without using the quadratic formula.
Why solve for t=0.1? It equals -30.451.
Homework Statement
A brick is dropped from a hot air balloon which is ascending at 5ms^-1. The height of the balloon above the ground at the time of release of the brick was 30m.
a. Determine the time that it took the brick to hit the ground.
b. At what height was the balloon above the...