The speed of the truck is 40 m s-1, after 10 seconds its speed decreases to 20

Question

The speed of the truck is 40 m s-1, after 10 seconds its speed decreases to 20 m s-1, its acceleration is

Options:

A . -1m/s2

B . -2m/s2

C . -4m/s2

D . -5m/s2

Answer: Option B

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