A body moving with a uniform acceleration covers 40 m in the first 4 seconds and 120 m in the next 4 seconds. Its velocity and acceleration are:
a) Velocity = 10 m/s, Acceleration = 0 m/s²
b) Velocity = 20 m/s, Acceleration = 5 m/s²
c) Velocity = 10 m/s, Acceleration = 5 m/s²
d) Velocity = 20 m/s, Acceleration = 0 m/s²