F. * 10ʻm. Also find weight of person whose mass is 80kg at that height A heavenly body has mass equal to half of the mass of the earth and its radius is half as that of earth. If a stone weigh 100N on the surface of earth, find the weight of stone on the heavenly body.

Answer mechanical energy;

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.