A toy car moves up a slope at a constant speed, as shown. The car is moved by a motor
with a power output of 5.2 W. The car gains a gravitational potential energy of 0.40 J in
a time of 1.1 s.
Which of the following expressions gives the work done, in J, against resistive forces?
A 5.2 − (0.40 × 1.1)
B (5.2 × 1.1) − 0.40
C (5.2 ÷ 1.1) + 0.40
D (5.2 × 1.1) + 0.40
(Total for Question 3 = 1 mark)
*P74468A0224*
Question
Physics
Edexcel2023
*P71915A01728*
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(b) An advert for an electric car has the following information:
• electric motor can develop up to 390 kW output power
• car achieves a velocity of 28 m s–1 from rest in 4.0 s at maximum power
Calculate the work done by resistive forces when the car accelerates to a velocity of