42) If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are

43) The angle of projection at which the horizontal range and maximum height of a projectile are equal to

44) A stone is thrown up a slope of inclination 60° to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection

45) In a simple harmonic motion, the position of equilibrium is always

46) If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is