- #1
StonieJ
- 29
- 0
A force of 5N acts on a 2 kg object that starts from rest. When the force has been acting for 2 s, the rate at which it is doing work is:
Here's how I tried to solve it.
Solve for acceleration, which I assumed was constant.
Then use the displacement equation to find the distance traveled.
However, the only possible answer choices are:
a) 5W b) 10W c) 25W d) 50W e) 75W
Where am I screwing up?
Here's how I tried to solve it.
Solve for acceleration, which I assumed was constant.
Code:
a = F/m = 5N / 2kg = 2.5 m/s/s
Then use the displacement equation to find the distance traveled.
Code:
x = xo + (vo)(t) + (1/2)(a)(t^2)
x = 0 + 0 + (1/2)(2.5 m/s/s)(2s)^2
x = 5m
Work = F * x = 5N * 5m = 25 J
Power = Work / t = 25J / 2s = 12.5 W
a) 5W b) 10W c) 25W d) 50W e) 75W
Where am I screwing up?