A block moving horizontally on a smooth surface with a speed of 40   m   s - 1 splits into two equal parts. If one of the parts moves at 60   m   s - 1 in the same direction, then the fractional change in the kinetic energy will be x :   4 where x = ________.

Question

A block moving horizontally on a smooth surface with a speed of 40 &#160; m &#160; s - 1 splits into two equal parts. If one of the parts moves at 60 &#160; m &#160; s - 1 in the same direction, then the fractional change in the kinetic energy will be x : &#160; 4 where x = ________.

Aicharya · Accepted Answer

2 m &#215; 40 = 60 &#215; m + m v V = 20 &#160; m / s Now &#916; K E = K E f - K E i = 1 2 &#160; m &#215; ( 20 ) 2 + 1 2 &#160; m &#215; ( 60 ) 2 - 1 2 2 &#160; m &#215; ( 40 ) 2 &#916; K E = 1 2 &#160; m ( 800 ) &#8658; K E i = 1 2 2 &#160; m &#215; ( 40 ) 2 = 1 2 &#160; m &#215; 3200 Fractional change = &#916; K E K E i = 1 4

A block moving horizontally on a smooth surface with a speed of 40   m   s - 1 splits into two…

Solution

A block moving horizontally on a smooth surface with a speed of 40 &#160; m &#160; s - 1 splits into two…

Solution

A block moving horizontally on a smooth surface with a speed of 40 m s - 1 splits into two…