Question

A jet plane takes about 56 s to go from rest to the takeoff speed of 120 mph (miles per hour). What is the average horizontal force that the seat exerts on the back of a 60-kg passenger during takeoff?

First make sure that each of the values are in SI units.

Use 1 mile = 1609 meters

v_{plane} =___________{meters}/{second}
120 mi/h (1609 m/mi)(1 h/3600s) = 53.6 m/s

F = change in momentum/time
= 60 (53.6)/56 = 57.5 Newtons

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