Answer:
Force of 6250N is required to slow down the body to zero.
Explanation:
Speed(V)=20m/s
Initial speed (u) =0m/s
Mass(M)=1000kg
Time(t)=3.2seconds
Using first equation of motion to find the acceleration of the body:
V=U + at
20m/s=0 + a*3.2s
Therefore, a=(20m/s)/3.2s
a=6.25m/s^2
To find the force required to stop the body or get it down to zero:
Force(F)=mass x acceleration
F=(1000kg)*(6.25m/s^2)
F=6250N.
Therefore a force of 6250N is required to slow it down.
