13 In a school experiment, a particle, of mass \(m\) kilograms, is released from rest at a point \(h\) metres above the ground.
At the instant it reaches the ground, the particle has velocity \(v \mathrm {~m} \mathrm {~s} ^ { - 1 }\)
13
- Show that
$$v = \sqrt { 2 g h }$$
13
- A student correctly used \(h = 18\) and measured \(v\) as 20
The student's teacher claims that the machine measuring the velocity must have been faulty.
Determine if the teacher's claim is correct.
Fully justify your answer.
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