At a given instant in time a 4.0kg rock is observed to be falling with an acceleration of 7.00 m/s. What is the magnitude of the gravitational force on the rock ?The acceleration due to gravity is g=9.8m/s2 express in newton

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping