Question

Question 5 of 10
2 Points
A truck is moving 14 m/s to the south. If it takes the truck 20 seconds to
reduce its velocity to 10 m/s south, what is its acceleration?
O
A. 0.2 m/s2 north
O
O
O
B. 0.2 m/s2 south
C. 5 m/s2 north
D. 5 m/s2 south
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Answer 1

Answer:

$a = 0.2 m/s^2$ towards North

Explanation:

Acceleration is defined as rate of change in velocity

So we will have

$a = \frac{v_f - v_i}{\Delta t}$

now we will have

$v_f = 10 m/s$

$v_i = 14 m/s$

time taken by it

$\Delta t = 20 s$

now we will have

$a = \frac{10 - 14}{20}$

$a = -0.2 m/s^2$