When A Clock Reads 4 0 Seconds A Cart S Velocity In The Positive X Direction Is

When a clock reads 4.0 seconds a cart’s velocity in the positive x direction is 6.0 m/s. when the clock reads 7.0 seconds, the cart’s velocity in the positive x direction is 7.0 m/s. what is the magnitude (in m/s2) of the average acceleration of the cart?