A 50.0 kg object is moving at 18.2 m/s when a 200 N force

is applied opposite the direction of the object's motion,

causing it to slow down to 12.6 m/s.

How long was this force applied?

distance = 21.56 m

Explanation:

given data

mass = 50 kg

initial velocity  = 18.2 m/s

force = -200 N ( here force applied to opposite direction )

final velocity = 12.6 m/s

solution

we know here acceleration will be as

acceleration a  = force ÷ mass

a =   =  -4 m/s²

we get here now required time that is

required time =     ...............1

put here value

required time =  

so distance will be

distance =    ........2

distance =  

distance = 21.56 m

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000