It takes a truck 3.56 seconds to slow down from 112 km/h to 87.4 km/h. What is its average acceleration?

1.92 m/s2

-1.92 m/s2

-6.81 m/s2

6.81 m/s2

option B

-1.92 m/s2

Explanation:

Given in the question,

time took by truck to slow down = 3.56 sec

initial speed of truck = 112 km/h

final speed of truck = 87.4 km/h

1 km/h = 0.277778 m/s

112 = 31.1 m/s

87.4 = 24.28 m/s

Formula use to calculate the acceleration

v - u = at

where v is final speed

u is initial speed

a is acceleration

t is time

plug values in the equation

24.28 - 31.1 = a (3.56)

-6.8 = a (3.56)

a = - 6.8 / 3.56

a = - 1.9 m/s²