**Paper 2 H - SAMPLE SET 1 Q25 ****Answers**

25) The table shows the stopping distances for a car.

(a) Use the data given to fill in the information missing at a speed of 32 m/s. [2]

(b) The car takes 6 m to brake when moving at 8 m/s.

Look at the graph of the car as it starts to brake and then stopping.

(b) The car takes 6 m to brake when moving at 8 m/s.

Look at the graph of the car as it starts to brake and then stopping.

Use the graph to show that the braking distance is 6 m. [2]

(c) The formula to work out kinetic energy is:

(c) The formula to work out kinetic energy is:

kinetic energy = 0.5 x mass x (velocity^{2})

A car has 30 000 J of energy and a mass of 1 tonne (1 tonne = 1 000 kg).

Calculate the velocity of the car and show your working. [2]

(d) Cars and lorries have different brakes.

Brakes absorb the energy of the vehicle before it comes to rest.

The brakes on lorries have larger brake discs and brake pads than cars.

Brakes are designed for increased air flow.

Explain why this is more important for lorries than cars. [4]

A car has 30 000 J of energy and a mass of 1 tonne (1 tonne = 1 000 kg).

Calculate the velocity of the car and show your working. [2]

answer: ……………… m/s

(d) Cars and lorries have different brakes.

Brakes absorb the energy of the vehicle before it comes to rest.

The brakes on lorries have larger brake discs and brake pads than cars.

Brakes are designed for increased air flow.

Explain why this is more important for lorries than cars. [4]

**(Total for Question 25 = 10 marks)**

**Answers**