A 30kg child runs 4m/s and jumps onto a shopping cart which has a mass of 20kg. Assuming the child rides on the card after the collision the speed of the child and shopping cart just after the child jumps on is how many m/s
The speed of the child and shopping cart just after the child jumps on is 4 m/s.
30 * 4 = 50 * v
v = 2.4 m/s
Answered, you are driving me crazy. Please stop the nonsense.