2.68 m/s^2
First, convert the speed of 60 mph to m/s. To do this, you first multiply by 1609.34 to get m/h
60 mile/h * 1609.34 m/mile = 96560.4 m / h
Then divide by 3600 to get m/s
96560.4 m/h / 3600 s/h = 26.82233 m/s
Finally divide by 10 seconds to get the acceleration
26.82233 m/s / 10 s = 2.682233 m/s^2