What causes chronic strains? A. dehydration B. improper lifting C. sudden injury

B.i.proper lifting

Explanation:

Strains can be acute or chronic. An acute strain is caused by trauma or an injury such as a blow to the body; it can also be caused by improperly lifting heavy objects or over-stressing the muscles. Chronic strains are usually the result of overuse--prolonged, repetitive movement of the muscles and tendons.

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For uniform acceleration

a = (v2 - v1) /t = 2.5      acceleration is constant 2.5

v2 = 2.5 * 4         v1 = 0 at t = 0

v2 = 2.5 m/s^2 * 4 s = 10 m/s