A 60 kg body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body is

A cord is used to lower vertically a block of mass $M$, a distance $d$ at a constant downward acceleration of $\frac{g}{4}$, then the work done by the cord on the block is

A body of mass $6kg$ is under a force which causes displacement in it given by $S=\frac{t^2}{4}$ maters where $t$ is time . The work done by the force in $2$ sec is

From an automatic gun a man fires 360 bullet per minute with a speed of 360 km/hour. If each weighs 20 g, the power of the gun is

The sum of the numbers 436.32, 227.2 and 0.301 in appropriate singnificant figures is

When a bicycle is in motio, the force of friction exerted by the ground on the two wheels is such that it acts