The coordinates in meters of the 360-kg sport plane’s center of mass relative to an earth-fixed reference frame during an interval of time are
x = 20t – 1.63t2,
y = 35t – 0.15t3,
and
z = –20t – 1.38t2,
where t is the time in seconds The y axis points upward. The forces exerted on the plane are its weight, the thrust vector T exerted by its engine, the lift force vector L. and the drag force vector D. At t =4 s, determine T + L + D.
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