It is found that \(\left | A+B \right |=\left | A \right |\).This necessarily implies,

A particle of mass m is observed from an inertial frame of reference and is found to move in a circle of radius r with a uniform speed v.The centrifugal force on it is

Directions : Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following

Statement-1 :K.E. of a moving body given by as² where s is the distance travelled in a circular path refers to a variable acceleration.

Statement-2 :Acceleration varies with direction only in this case of circular motion.

Directions : Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following

Statement-1 : Two stones are simultaneously projected fromlevel ground from same pointwith same speeds but different angles with horizontal. Both stones move in same verticalplane. Then the two stones may collide in mid air.

Statement-2 : For two stones projected simultaneously from same point with same speed at different angles with horizontal, their trajectories may intersect at some point.

Directions : Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following

Statement -1 :If dot product and cross product of \(\overrightarrow{A}\) and \(\overrightarrow{B}\) are zero, it implies that one of the vector \(\overrightarrow{A}\) and \(\overrightarrow{B}\) must be a null vector

Statement -2 :Null vector is a vector with zero magnitude.

Directions : Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following

Statement -1 : \(\overrightarrow{\tau }=\overrightarrow{r}\times \overrightarrow{F}\) and \(\overrightarrow{\tau }\neq \overrightarrow{F}\times \overrightarrow{r}\)

Statement -2 : Cross product of vectors is commutative.

A projectile is thrown in the upward direction making an angle of 60° with the horizontal direction with a velocity of 147 m s^–1. Then the time after which its inclination with the horizontal is 45°, is