Which of these situations can increase the reaction time of a driver? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1

To find the work done, we use the formula:

$W = F imes d$

where:

• $W$ is the work done,
• $F$ is the force, and
• $d$ is the distance traveled.

Here, we substitute the values: $W = 1200 ext{ N} imes 8.0 ext{ m} = 9600 ext{ J}$

Thus, the work done is 9600 Joules.

The kinetic energy (KE) can be calculated using the formula:

$KE = \frac{1}{2} mv^2$

where:

• $m$ is the mass of the car, and
• $v$ is the velocity.

Substituting the given values: $KE = \frac{1}{2} \times 1400 ext{ kg} \times (25 ext{ m/s})^2 = \frac{1}{2} \times 1400 \times 625 = 437500 ext{ J}$

Thus, the kinetic energy of the car is 437500 Joules.