A container with mass M kg is dropped by a helicopter from height H km at time t = 0, with zerovelocity. From the outset, its fall is controlled by gravity and the force of air resistance, ƒ (v) = − kv,where u is the current velocity of the container.In 7 seconds after the drop, a parachute opens, resulting in an increase of air resistance up toF(v) = = -Kv. Determine the time T at which the container touches the ground, and its velocity at thismoment, ifM = 200 kg, H = 2000 m, 7 = 20 s, k = 10 kg/s, and K = 400 kg/s.

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