Answer:
-0.28 m/s²
Explanation:
acceleration, a = (v - u)/t where u = initial velocity = 30 km/hr = 30 × 1000/3600 = 8.33 m/s and v = final velocity = 20 km/hr = 20 × 1000/3600 = 5.56 m/s and t = time = 10 s.
Substituting the values of the variables into the equation, we have
a = (v - u)/t
= (5.56 m/s - 8.33 m/s)/10 s
= -2.77 m/s ÷ 10 s
= -0.277 m/s²
≅ -0.28 m/s²
