Question

How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s? a. 2.0 W c. 9.8 W b. 4.0 W d. 39 W

Answer 1

Answer:

d: 39W

Explanation:

Power(P) = w/t = F*d/t = F*v = m*a*v= 2*9.8*2 = 39.2W

Answer 2

The power required to lift a 2 kg mass at a speed of 2 m/s is 39 W.

Answer: Option D

Explanation:

Power required to lift a mass of about 2 kg will be equal to work done attained by the object per unit time. And, the mass (m) of the object is given as 2 kg and speed (v) as 2 m/s, then

                $\text { Power }=\frac{\text {work done }(w)}{\text { time }(t)}$

And, we know the following formula,

               $w=\text { Force } \times \text { distance}$

               $\text {Force}=m \times \text {acceleration}$

               $\text {velocity}=\frac{\text {distance}}{\text {time}}$

By applying this into the power equation, we get,

               $\text { Power }=m \times \text { acceleration } \times \text { velocity }=2 \times 9.8 \times 2=39.2 \mathrm{W}$

Hence, the power required to lift a mass, the rounded value would be 39 W.