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3 m/s
To find the acceleration of the jet, we first need to convert the speed from km/h to m/s. 153 km/h is equal to 42.5 m/s. The final velocity is 0 m/s, so the change in velocity is 42.5 m/s. The acceleration can be calculated using the formula acceleration = change in velocity / time. Therefore, the acceleration of the jet is 42.5 m/s divided by 2 s, which equals 21.25 m/s².
Ignoring air resistance:acceleration due to gravity is approx 9.81 m/s²Using Newton's equation of motion:v = u + atwhere:v = final velocity (to find)u = initial velocity = 0 m/s as it was at resta = g - acceleration due to gravity (in a downward direction)t = 8 sv = 0 + g × 8 = 8g (downwards) Taking g as 9.81 m/s² this makes the final velocity v ≈ 8 s × 9.81 m/s² = 78.48 m/s ≈ 78.5 m/s
s = 9n - 18.
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