Question

$<heyfriend>$
$give answer of this question$

Answer 1

Work done = Change in kinetic energy

mass = 20 kg

initial velocity = 5 m/s

final velocity = 2 m/s

initial kinetic energy =  1/2 * 20 * 5*5 = 250 J

final kinetic energy = 1/2 * 20 *2*2 = 40 J

change in kinetic energy = 40 - 250

                                          = -210 J

Work done = -210 J