Answers

2015-06-02T16:41:04+05:30
U=0
t=2s
s=20m
v=s/t=20/2=10m/s
a=v-u/t=10-0/2=5m/s square

s=160m
t=4-2=2s
v=s/t=40m/s

u=10m/s
v=40m/s
a=v-u/t=15m/s square

t=7-2=5s
u=40m/s
v=?
a=v-u/t=40-x/5
125=40-x
v=85m/s
therefore final velocity is 85m/s
2 3 2