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14-11-2019
Physics

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An arrow with a mass of 45.3g is fired vertically into the air at 82.5m/s from a height of 1.41m. Calculate the speed of the arrow when it reaches a height of 36.3m.

... please help

Respuesta :

Hania12 Hania12

17-11-2019

Answer:

78.156 m/s

Explanation:

(assuming no upthrust from the air on the arrow)

Ball has a motion only under ther gravity

Apply motion equation upwards

(g = 10m/s²)

V² = U² + 2as

= 82.5² + 2*(-10)*(36.3-1.41.)

= 6108.45

V = 78.156 m/s

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