## Essential University Physics: Volume 1 (3rd Edition)

a) $F=-.4mg$ b) $F=2.4mg$ c) $F=1.4mg$
We use Newton's Second Law to find: a) $F=m(a+g)=(m)(-1.4g+g)=-.4mg$ b) $F=m(a+g)=(m)(1.4g+g)=2.4mg$ $F=m(a+g)=(m)(1.4g+0)=1.4mg$