Which one of these is a vector quantity? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1

To find the velocity of the child and the cart, we can use the formula for momentum, which is given by:

$p = mv$

Where:

• $p$ is the momentum
• $m$ is the mass
• $v$ is the velocity

Given:

• Total momentum, $p = 90 \text{ kg m/s}$
• Total mass, $m = 60 \text{ kg}$

We can rearrange the formula to find the velocity:

$v = \frac{p}{m}$

Substituting the values:

$v = \frac{90 \text{ kg m/s}}{60 \text{ kg}} = 1.5 \text{ m/s}$

Thus, the velocity of the child and the cart is 1.5 m/s.