Question

Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk.

What is his power output? (Power: P = W/t)

Answer 1

Power = $\mathsf{\dfrac{Work \:done} {time}}$

Here,

Work done = Force × displacement

W = f. s

W = 10 N × 400 cm = 10 N × 400/100 m

W = 40 Nm or J.

↪️ Power output = $\mathsf{\dfrac{W} {t}}$

↪️Power output = $\mathsf{\dfrac{40} {8}}$

➡️ Power output, P = 5 Nm/s