Question

A boy weighing 40 kg makes a high jump of 1.5 m.
(i) What is his kinetic energy at the highest point?
(ii) What is his potential energy at the highest point? (g = 10 m/s2)

Answer 1

Answer:

(I). The kinetic energy at the highest point is zero.

(II). The potential energy at the highest point is 60 J.

Explanation:

Given that,

Weight of boy = 40 kg

Height = 1.5 m

(I). We need to calculate the kinetic energy at the highest point

The kinetic energy at the highest point is zero because the velocity is zero at highest point.

(II) We need to calculate the potential energy at the highest point

Using formula of potential energy

$P.E=mgh$

$P.E=40\times1.5$

$P.E=60\ J$

Hence, (I). The kinetic energy at the highest point is zero.

(II). The potential energy at the highest point is 60 J.

Learn more :

Topic : kinetic and potential energy

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Answer 2

Answer:

k.n=0 ( because velocity is zero)

p.e=600j