A projectile is fired with KE of 1,kJ . If range is maximum, .......... J is its KE at highest point

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5.Work, Energy, Power and Collision

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A projectile is fired with $KE$ of $1\,kJ$. If the range is maximum, .......... $J$ is its $KE$ at the highest point.

$250$

$500$

$750$

None of these

Solution

Angle of projection will be $45^o$. At the highest point, $KE$ is due to the horizontal component of velocity. It will be half of the initial $KE$ , i.e, $500\,J$ .

Standard 11

Physics

A $120\, g$ mass has a velocity $\vec v = 2\hat i + 5\hat j\,m{s^{ – 1}}$ at a certain instant. Its kinetic energy is ……………… $\mathrm{J}$

medium

If a body of mass $200\, g$ falls from a height $200 \,m$ and its total $P.E.$ is converted into $K.E.$ at the point of contact of the body with earth surface, then what is the decrease in $P.E.$ of the body at the contact $(g = 10\,m/{s^2})$ ………… $\mathrm{J}$

easy

If the momentum of a body is increased by $100\%$, then the percentage increase in the kinetic energy is ………… $\%$

medium

Two bodies of masses m and $2m$ have same momentum. Their respective kinetic energies ${E_1}$ and ${E_2}$ are in the ratio

easy

Define kinetic energy. Give its unit and dimensional formula and mention works by using it.

hard

A projectile is fired with $KE$ of $1\,kJ$. If the range is maximum, .......... $J$ is its $KE$ at the highest point.

Solution

Similar Questions

A $120\, g$ mass has a velocity $\vec v = 2\hat i + 5\hat j\,m{s^{ – 1}}$ at a certain instant. Its kinetic energy is ……………… $\mathrm{J}$

If a body of mass $200\, g$ falls from a height $200 \,m$ and its total $P.E.$ is converted into $K.E.$ at the point of contact of the body with earth surface, then what is the decrease in $P.E.$ of the body at the contact $(g = 10\,m/{s^2})$ ………… $\mathrm{J}$

If the momentum of a body is increased by $100\%$, then the percentage increase in the kinetic energy is ………… $\%$

Two bodies of masses m and $2m$ have same momentum. Their respective kinetic energies ${E_1}$ and ${E_2}$ are in the ratio

Define kinetic energy. Give its unit and dimensional formula and mention works by using it.

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