Total opposing force is 7 N plus 3 N, totaling 10 N, producing a deceleration of 5 m s-2 on the 2 kg mass. Using kinematics, the stopping distance traveled before coming to rest is 10 meters.
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From Fig. 6.41, the slope of the velocity-time line gives an acceleration of 2.5 m s-2. Multiplying this acceleration by the object mass of 10 kg gives a constant acting force of 25 N.
A cushioned landing mat increases the impact time during which the athlete’s downward velocity reduces to zero. According to Newton’s second law, extending the duration reduces acceleration, thereby significantly reducing the impact force and preventing injury.
Option (iv) is correct because Newton’s second law of motion establishes that when a net force acts on an object, it produces acceleration in the direction of the force directly proportional to its magnitude.
Forward force by ninety-five oarsmen is 19000 N and backward force by five oarsmen is 1000 N. Subtracting opposing forces gives an unbalanced forward net force of 18000 N acting on the boat.