Question

(c) After reaching that speed, the pilot turns off the engine and drifts to a stop over a distance of 50.0 meters. Find the resistance force, assuming it's constant.

PRACTICE IT Use the worked example above to help you solve this problem. An airboat with mass 4.38 x 10 kg, including the passenger, has an engine that produces a net horizontal force of 8.18 x 102 N, after accounting for forces of resistance (a) Find the acceleration of the airboat. 1.87 m/s2 b) Starting from rest, how long does it take the airboat to reach a speed of 16.0 m/s? 8.56 (c) After reaching that speed, the pilot turns off the engine and drifts to a stop over a distance of 50.0 meters. Find the resistance force, assuming it's constant. 1121 The response you submitted has the wrong sign. N

Answer 1

v² = 0 = u² + 2as

= (16m/s)² + 2a(50m) → a = -2.56m/s²
F = ma

= 438kg * -2.56m/s²

F= -1121.3N (that is, against)

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