As your skateboard coasts uphill, your speed changes from 3 m/s to 1 m/s in
3 seconds. What is your deceleration?

Explanation:

Accelerated Motion

The acceleration of a moving body is defined as the relation of change of speed (or velocity in vector form) with the time taken. The formula is given by

Or, equivalently

Where vf and vo are the final and initial speeds respectively. The problem gives us these values: v0 = 3 m/s, vf = 1 m/s, t = 3 seconds. Computing a

The negative sing of a indicates there is deceleration or decreasing speed

grav forces affect all objects magnetic forces affect magnetic objects and electric currents