Question

Let's assume that the car, of mass $1550kg$ , can reach a speed of $26.8 \, m/s$ in $7.1s$ . What is the average power needed to accomplish this (Given: $1hp=746$ Watt)

• A. $105 \, hp$
• B. $110 \, hp$
• C. $1210 \, hp$
• D. $1040 \, hp$

Answer 1

Answer: (A)

$ P _{ av }=\frac{ W _{\text {Total }}}{\text { time }}=\frac{\frac{1}{2} mv ^2}{\text { time }}=\frac{\frac{1}{2}(1550)(26.8}{7.1} / 746 $
$105 hp$