A car starts from rest and attains a velocity of 10 m/s in 40 s. The driver applies brakes and slow down the car to 5 m/s in 10 s. Find the acceleration of the car in both the cases.

• A. \[-0.25\text{ }m/{{s}^{2}}\text{ }and-0.5\text{ }m/{{s}^{2}}\]
• B. \[0.25\text{ }m/{{s}^{2}}and-0.5\text{ }m/{{s}^{2}}\]
• C. \[0.35\text{ }m/{{s}^{2}}\text{ }and-0.15\text{ }m/{{s}^{2}}\]
• D. \[0.45\text{ }m/{{s}^{2}}and-0.25\text{ }m/{{s}^{2}}\]
• E. None of these