A weightlifter uses a force of 98 N to move a barbell?

Question

1.5 meters in 10 seconds. How much power was used to move the barbell?

Answer 1

p=Wd/t
to get Wd:
Wd=fd

p=fd/t
=98N*1.5m/10s
=147J/10s
=14.7 W

Answer 2

Power P is rate of energy flow E/t
P=E/t
Energy E is work done by force F over parallel distance s
E=F s

P= 98 x 1.5/ 10=14.7 W

Answer 3

power = work/time.

Thus, the work equals force times distance 98 x 1.5 = 147 Nm or joules

time is 10 seconds.

its 147/10 = 14.7 J/s or 14.7 Watts.

overall,

W= Fd

Power =Work/time