Aman carries a load of 20n on his head over a horizontal distance of 20 m how much work is done by the man

Work done in horizontal direction = 0 as the potential energy is not changed and the change in kinetic energies : initial and final - is zero.

work done when the person carries the suitcase in vertical direction =

  = m g h = change in potential energy = 30 kg * 9.8 m/sec/sec * 10 m

  =  2940 Joules

There is a force F1 lifting the body upwards. There is Weight W = m g pulling the body downwards.  The net force F2 on the body is upwards with acceleration a.

  F2 = m a  = F1 - W = F1 - m g

          a =  F1 / m - g

Work done by Force F1 with which the object is lifted = F1 . s = 230 Joules

     F1  = energy spent / distance = 230 J / 2 m  = 115 Newtons

Net Acceleration of the body = a = F1 / m - g = 115/10 - 10  = 1.5 m/sec/sec

 m = 2 kg          F = 8 Newtons        t = 12 sec

 a = F/m = 4 m/sec/sec

v = u + a t = 0 + 4 * 12 = 48 m/sec

kinetic energy = 1/2 m v² = 1/2 * 2 * 48 * 48 = 48² Joules

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emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50