Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg . dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s .

Mass of Britney with skate board = 62 kg 
Total with pumpkin m = 62 + 3.7 = 65.7 kg
 Speed of the skateboard V = - 0.16 m/s (backward)
 The final momentum M = m x V = 65.7 x -0.16 = -10.512 kg-m/s
 For pumpkin momentum = m x V = 3.7V
 Since the total initial momentum and the final momentum are zero,
 3.7V + (-10.512) = 0 => 3.7V = 10.512
 The Speed of the pumpkin V = 10.512 / 3.7 = 2.84 m/s

Answer8.0m;