Aparachutist, after opening her parachute, finds herself gently floating downward, no longer gaining speed. she feels the upward pull of the harness, while gravity pulls her down. which of these two forces is greater? or are they equal in magnitude?

Since parachutist is moving downwards with constant speed

so here we can say

acceleration is rate of change in velocity

since velocity is given constant here

So acceleration in this case will be zero

now we know from Newton's II law

here a = 0

here

= force due to gravity

= force due to buoyancy

So here we can say

so

so upward force on it will be balanced by downward force.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."