Exciting Stunt Man Car Speed Challenge!

How fast must the speedometer on the car reach before it leaves the lorry for the stunt to be successful?

Answer:

To achieve a velocity of -5.00 m/s when the car leaves the lorry, the car's speedometer needs to read 30.0 m/s.

Explanation: The stunt man needs to have the car moving at a velocity of -5.00 m/s the moment it leaves the lorry to pull off the stunt. The negative sign in the given velocity indicates that the movement of the car is in the opposite direction to the lorry. The lorry is moving at a pace of 25.0 m/s. To achieve a relative velocity of -5.00 m/s, the speedometer on the car must read 30.0 m/s in the same direction as the lorry's motion. This is because, when it leaves the lorry, the car's speed will be its speed relative to the lorry (30.0 m/s) minus the lorry's speed (25.0 m/s), which gives us -5.0 m/s, the required velocity for the stunt.