A man whose mass is m kg jumps vertically into air from sitting position in which his centre of mass is h1 from the ground. when his feet are just about to leave the ground his centre of mass is h2 from the ground and finally rises to h3 when he is at the top of the jump.what is the average upward force exerted by the ground on him?

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Q. A man whose mass is

m

kg jumps vertically into air from a sitting position in which his centre of mass is at a height

h_{1}

from the ground. When his feet are just about to leave the ground his centre of mass is

h_{2}

from the ground and finally rises to

h_{3}

when he is at the top of the jump. What is the average upward force exerted by the ground on him?

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If a man of mass M jumps to the ground from a height h and his centre of mass moves a distance of x during the impact, the average force acting on him (assuming his retardation to be constant during his impact with the ground) is

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