Answer:
acceleration=change in velocity/time
a=(60-40)/(8-4)
a=20/4
a=5m/s²
b) V=u+at
V=60+5(2)
V=60+10
V=70m/s
Explanation:
The object started from rest and changes it's velocity from 0 to 40 to 60. From time of 0 to 4 to 8
V= final velocity
U= initial velocity
Since the object moves with uniform acceleration, one can choose 0m/s and 40m/s as initial and final velocity respectively.
b) we can make 60m/s the initial velocity . From the first equation of motion
V=u+at
Where V is the final velocity after the 2 seconds
