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It appears that you've shared two images: one is a graph of speed as a function of time, and the other contains a set of questions related to frictional forces and energy in vehicle dynamics.

From the graph:
- The x-axis represents time in seconds.
- The y-axis represents speed in km/h, with speeds ranging between 80 and 100 km/h over time.

The questions seem to relate to energy loss due to friction at certain speeds, specifically 90 km/h. The answers provided give specific numerical approximations, such as:
- Friction force at 90 km/h: 670 N
- Braking power: 17 kW
- Energy consumed by friction over 100 km at 90 km/h: 67.2 MJ
- Motor energy consumption for 100 km: 224 MJ, which converts to 62 kWh.

Would you like me to help explain how to calculate these values step by step, or clarify one of the questions further?

### Related questions:
1. How do we calculate the frictional force at a given speed?
2. What is the formula to determine braking power?
3. How is energy consumed over a 100 km journey calculated based on speed and friction?
4. How does motor efficiency relate to the energy required to overcome friction?
5. What assumptions are being made about the driving conditions in these calculations?

**Tip:** Power is the rate of energy consumption. You can calculate it by multiplying force by velocity (in consistent units).

What is the frictional force produced at a speed of 90 km/h? How do we calculate the energy consumed by friction over 100 km at 90 km/h?

Explore how to calculate frictional force at 90 km/h and the energy consumed over 100 km in vehicle dynamics. Includes step-by-step solutions and key formulas involving force, power, and energy. Suitable for high school physics students.

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