Question

A cable with 19.0 N of tension pulls straight up on a 1.50 kg block that is initially at rest. What is the block's speed after being lifted 2.00 m ? Solve this problem using work and energy

Answer 1

The final speed of the block, after being lifted 2.00 m is 3.39 m/s

What is speed?

Speed can be defined as the rate of change in the distance of a body.

To calculate the speed of the block after being lifted 2.00 m,  first, we need to calculate the acceleration of the block using the formula below

Formula:

• T-mg = ma......... Equation 1

Where:

• T = Tension in the cable
• m = mass of the cable
• a = acceleration
• g = acceleration due to gravity

Restructuring the formula above,

• a = (T-mg)/m............... Equation 2

From the question,

Given:

• T = 19 N
• m = 1.5 kg
• g = 9.8 m/s²

Substitute these values into equation 2

• a = [(19)-(1.5×9.8)]/1.5
• a = 4.3/1.5
• a = 2.87 m/s²

Finally, to calculate the speed of the block, we use the formula below.

• v² = u²+2as.......... Equation 3

Where:

• v = Final speed
• u = initial speed
• a = acceleration
• s = distance

From the question,

Given:

• u = 0 m/s
• a = 2.87 m/s²
• s = 2.00 m

Substitute these values into equation 3

• v² = 0²+(2×2×2.87)
• v² = 11.48
• v = √11.48
• v = 3.39 m/s

Hence, The final speed of the block, after being lifted 2.00 m is 3.39 m/s.

Learn more about speed here: brainly.com/question/6504879