The speed-time graph of a cart is shown on the left. A force acts to slow the cart down from 23m/s to 10m/s.
What is the mass of the cart if the force acting on it has a magnitude of 5.7N?

Step 1 Calculate the deceleration.
deceleration = change in speed/period of time
Change in speed = final speed - initial speed =
10 -23= -13m/s (the negative sign indicates deceleration)
Period of time = 14 seconds
Acceleration = -13m/s/14/s = 0.93 m/s/s
Step 2 Calculate the mass of the cart.
m =f/a => 5.7 / 0.93 = 6.13Kg.

Correct

The mass is 6.13kg