The problem gives the initial velocity by saying "dropped." This indicates a velocity of zero. Acceleration can also be found because the object is in free fall. It would experience the acceleration of gravity. We can use the kinematic equation:

$(y_f-y_i)=V_it+\frac{1}{2}at^2$

The velocity term completely cancels because the object was dropped with an initial velocity of 0.

$(18-50)=\frac{1}{2} (32.17)t^2\\$

$-32=-16.085t^2\\t=\sqrt{1.989} =1.41s$

8 0

3 years ago

Electricity Bill Charges

masya89 [10]

Answer:

a) 293 units

b) £57.95

Step-by-step explanation:

New reading: 6538 units

Old reading : 6245 units

The amount use is the difference between the two readings.

6538 - 6245 = 293

Answer: 293 units

293 is the same as 200 units plus another 93 units.

The first 200 units are charged at 22p per unit

Cost of the first 200 units: 200 units * 22p/unit = 4400p

Remaining units are charged at 15p per unit

Cost of the additional 93 units: 93 units * 15p/unit = 1395p

Total charge: 4400p + 1395p = 5795p = £57.95

Answer: £57.95

6 0

3 years ago