A stunt man jumps his car over a crater as shown (neglect air resistance)
during the whole flight the driver experiences weightlessness
during the whole flight the driver never experiences weightlessness
during the whole flight the driver experiences weightlessness only at the highest point
the apparent weight increases during upward journey
Which of the following is self adjusting force?
A weight can be hung in any of the following four ways by string of same type. In which case is the string most likely to break?
Objects $A$ and $B$ each of mass $m$ are connected by light inextensible cord. They are constrained to move on a frictionless ring in a vertical plane as shown in figure. The objects are released from rest at the positions shown. The tension in the cord just after release will be
Two blocks are connected by a spring. The combination is suspended, at rest, from a string attatched to the ceiling, as shown in the figure. The string breaks suddenly. Immediately after the string breaks, what is the initial downward acceleration of the upper block of mass $2\,m$ ?