Question

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a velocity of 30 meters/second?

Answer 1

v o = 20 m / s ( initial velocity )
t = 2.0 s
v = 30 m / s
a - acceleration:
v = v o + a t
a t = v - v 0
a = ( v - v o ) / t
a = ( 30 m/s - 20 m/s ) / 2 s = 10 m / s : 2 s = 5 m/s²