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Q79 (NDA-I/2010) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

A body is thrown vertically upwards and then falls back on the ground. Its potential energy is maximum

Result
Your answer: —  Â·  Correct: B
Explanation

Gravitational potential energy (PE) is the energy stored in an object due to its position relative to a reference point, typically the Earth's surface [t3][t6]. It is calculated using the formula PE = mgh, where 'm' is mass, 'g' is acceleration due to gravity, and 'h' is height [t3]. When a body is thrown vertically upwards, its kinetic energy is gradually converted into potential energy as its height increases [t4]. At the maximum height, the object's velocity momentarily becomes zero, meaning its kinetic energy is zero and its potential energy is at its maximum value [c1][t1]. Conversely, at the ground level (h=0), the potential energy is zero, and the energy is entirely kinetic [t2][t4]. Therefore, the potential energy reaches its peak at the highest point of the trajectory before the object begins its return journey [c1][t4].

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Activity 5.8: Let us observe > p. 72
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