1.The mass of a wheel is 4kg and its radius of gyration about an axis is 25cm. what is its moment of inertia? to produce an acceleration of 2 rads-2, what amount of torque is required to apply on it?
2. A driver of a car moving at 108 kmh-1 saw a boy at 45.5m away. As the brake was instantly pressed , the car stoped 50cm away from the boy. how much time did the car take to stop and calculate the applied force on it? Given that the mass of the car with passenger is 1000kg.