A ball is rolled off the edge of a horizontal table at a speed of 4 m/second.  It hits the ground after 0.4 second.  Which statement given below is true a) It hits the ground at a horizontal distance 1.6 m from the edge of the tableb) The speed with which it hits the ground is 4.0 m/secondc) Height of the table is 0.8 md) It hits the ground at an angle of 600 to the horizontal

Vertical component of velocity of ball at point P vV=0+gt=10×0.4=4 m/sHorizontal component of velocity = initial velocity⇒vH=4 m/sSo the speed with which it hits the groundv=vH2+vV2=42 m/s and tanθ=vVvH=44=1⇒θ=450It means the ball hits the ground at an angle of 450 to the horizontal.Height of the table h=12gt2=12×10×(0.4)2=0.8 mHorizontal distance travelled by the ball from the edge of table h=ut=4×0.4=1.6 m