A50 kg boy runs at a speed of 10 m/s and jumps onto the cart. the cart is initially at rest. if the speed of the cart with the boy on it is 2.5m/s , determine the mass of the cart

Mass of the cart is 150 kg.

Step-by-step explanation:

Mass of the boy = 50 kg

Speed of the boy = 10 meter per second

Momentum of the boy = mv

Where m = mass of the boy

v = velocity of the boy

Momentum of the boy = 50 × 10 = 500 kg meter per second

Let the mass of the cart = m

Therefore, mass of the cart with the boy = (m + 50) Kg

Velocity of the cart after the boy jumps on it = 2.5 meter per second.

Momentum of the cart with boy = (m + 50)2.5

Now by conservation of the momentum,

(m + 50)2.5 = 500

m + 50 =

m + 50 = 200

m = 200 - 50

m = 150 kg

Therefore, mass of the cart is 150 kg.

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.