Problema Solution
a projectile is fired vertically upward with an initial velocity of 40m/s. Find the position and velocity of the projectile at 1, 3, 5 and 7 s ?
Answer provided by our tutors
we have v=v0-gt
position: h=vot-1/2*gt^2
at 1s: v=40-10=30m/s
h=40-5=35m
at 3s : v=40-30=10m/s
h=40*3-5*9=75m
at 5s: v=40-50=-10m/s
h=75
at 7s: v=40-70=-30m/s
h=35m