Question

What is the potential energy of a stone at maximum height of mass 1 kg and thrown at a velocity of 10 m/s?​

Answer 1

Given,

$u=10m/s \\ </p><p>v=0 \\ </p><p>a=g=10m/ {s}^{2}$

(velocity of a body moving upwqard is decreasing so acceleration is negative)

${v}^{2} = {u}^{2} +2as \\ \\ 0 = {10}^{2} + 2 \times (- 10) \times s \\ \\ 0 = 100 - 20s \\ \\ 20s = 100 \\ \\ s = \frac{100}{20} \\ \\ s = 5$

$U=mgh=1×10×5=50J.$