The answer is it's middle the nueculs
... We know that there are no forward or backward forces on the object, because its forward speed is constant.
... The left and right forces on the object add up to zero, so it won't begin to move left or right. It'll just keep on with the same 20 m/s forward motion.
... Its velocity after 2 seconds, 10 seconds, or an hour, will still be 20 m/s forward.
Answer:
66.7%
Explanation:
There are 6 pulleys, so the mechanical advantage is 6.
The theoretical force needed to overcome 1200 N is therefore:
1200 N / 6 = 200 N
The actual force is 300 N. So the efficiency is:
200 N / 300 N × 100% = 66.7%
<span>a = (v2 - v1)/t= acceleration formula
a = (70 - 0)/7
a = 10 km/hr/sec
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It's better to use as few units as possible.
10 km/hr = 10 km*1000 m/km/(1 hr*3600 sec/hr) = 25/9 m/sec
a= 25/9 m/sec/se</span>