How much work will you do if you push a block of concrete 4.3m along. A floor with a steady force of 25 N 3. A 1000 kg car has a velocity of 17 m/s. What is the cars kinetic energy?
Answer (1)
2. SOLUTION:Step 1: List the given values.[tex]\begin{aligned} & F = \text{25 N} \\ & d = \text{4.3 m} \end{aligned}[/tex]Step 2: Calculate the work.[tex]\begin{aligned} W & = Fd \\ & = \text{(25 N)(4.3 m)} \\ & = \boxed{\text{107.5 J}} \end{aligned}[/tex]Hence, I will do 107.5 J of work.3. SOLUTION:Step 1: List the given values.[tex]\begin{aligned} & m = \text{1,000 kg} \\ & v = \text{17 m/s} \end{aligned}[/tex]Step 2: Calculate the kinetic energy.[tex]\begin{aligned} KE & = \frac{1}{2}mv^2 \\ & = \frac{1}{2}(\text{1,000 kg})(\text{17 m/s})^2 \\ & = \boxed{\text{144,500 J}} \end{aligned}[/tex]Hence, the car's kinetic energy is 144,500 J.
