The change in velocity with a constant resistance of the body during the first 20 s = -10/9 ms⁻¹
The change in velocity of the body during the first 20 s = 10/9
Mass = 18 kg.
Resistance to motion = 20 N
Decreases at a uniform rate from 60 N to 35 N
time = 25 s,
Force which decreases at a uniform rate = (60 - 35)/25 = 25/25
= 1 NS⁻¹
Initial velocity,
F = p/t
= mv/t = 18*v/t
V = (60 - 20) /18 = 20/9
Final velocity,
Decreases at a uniform rate = = 1 NS⁻¹
at 20 s = 20 N decrease
total force applied at 20 s without resistance = 60 -20-20 = 20.
V final = 20/18 = 10/9
Change in velocity = V final - v initial
= 10/9 - 20/9
= -10/9
Resistance is described as a refusal to provide in or to something that slows down or prevents some thing. An instance of resistance is a toddler combating against her kidnapper. An instance of resistance is wind against the wings of a aircraft.
The unit of the electrical resistance, measured with direct present day, is the ohm (Ω), named after the German physicist and mathematician Georg Simon Ohm. in step with ohm's regulation, the resistance R is the ratio of the voltage U across a conductor and the modern R = U / I.
Learn more about resistance here:-brainly.com/question/17563681
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