Use the displacement law, peak wavelength = 0.0029/T =0.0029/30000 = 97nm
The formula for potential energy would be PE = mgh
Where: m is the mass; g is the acceleration due to gravity, and h would be height.
So plugging in the data:
PE = 150kg × 9.8 m/s^2 × 10m
= 14700 Joules would be the potential energy for this problem.
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Given: Initial velocity 
Final Velocity 
To find : Height when jumpled 8.0 m/s upwards.
Solution: We already have values of initial velocity and final velocity.
We know, accereration due to gravity is given by
.
It's negative because when jump it's in opposite direction.

Where h is the height when jumpled 8.0 m/s upwards.
Plugging values of 

64= 225 -19.6h
Subtracting both sides by 225.
64-225= 225 -19.6h-225.
We get,
-161 = -19.6h
Dividing both sides by -19.6, we get

h= 8.2143
Rounding to nearest tenth, we get
h= 8.2 meter.
His height is 8.2 meter when he is jumping 8.0 m/s upwards.
Newton's 2nd law of motion:
Force = (mass) · (acceleration)
= (70 kg) · (4.2 m/s²)
= (70 · 4.2) kg·m/s²
= 294 newtons