How much energy produced in burning of $1\, kg$ coal ?

Which of the following graphs is correct between kinetic energy $ (E), $ potential energy $(U)$  and height $(h)$ from the ground of the particle

A toy car of mass $5 \,kg$ moves up a ramp under the influence of force  $ F$  plotted against displacement $x$. The maximum height attained is given by

A particle of mass $100\ g$ is thrown vertically upwards with a speed of $5\ m/s$. The work done by the force of gravity during the time the particle goes up is.....$J$

A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses $0.36 \mathrm{~kg}$ and $0.72 \mathrm{~kg}$. Taking $g=10 \mathrm{~m} / \mathrm{s}^2$, find the work done (in joules) by the string on the block of mass $0.36 \mathrm{~kg}$ during the first second after the system is released from rest.

A neutron moving with velocity $u$ collides elastically with an atom of mass number $A$ . If the collision is head-on and the initial kinetic energy of neutron is $E$ , then the final kinetic energy of the neutron after collision is