Final answer:
The mobile phone breaking when dropped from a height can be explained by the second law of motion and the conservation of momentum.
Step-by-step explanation:
The correct answer is b. second law of motion, as it explains the relationship between force, mass, and acceleration. When a mobile phone is dropped from a height, the force of gravity acts on it, causing it to accelerate towards the ground. According to Newton's second law of motion, the acceleration is directly proportional to the force applied and inversely proportional to the mass of the object.
When the phone hits the ground, the force exerted on it by the ground can be significant enough to cause it to break. This force is a result of the phone's momentum suddenly changing, which is described by the law of conservation of momentum. Therefore, option d. conservation of momentum also plays a role in explaining why the phone breaks when dropped from a height.
It is important to note that the first law of motion (a) does not explain the breaking of the phone, as it states that an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an external force. The third law of motion (c) deals with the interaction between two objects and is not directly relevant to the phone breaking when dropped.
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