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The energy of hydrogen atom in the nth o...

The energy of hydrogen atom in the nth orbit is En, then the energy in the nth orbit of single ionised helium atom is

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Velocity of a body at t= 2 s is zero
Change in momentum `Delta vec(p ) = m (vec(v )_(2) - vec( v )_(1)) =0`
Velocity at t= 6 s is a slope of given graph `|vec( v)| = (20)/( 2) =10ms^(-1) `
Now impulse of force `=Delta vec( p)`
`vec( F ) Delta t= m (v _(2) - v_(1))`
`=-30`
`|vec( F ) Delta t |= 30 Ns`
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