Because kinetic energy do have more than potential energy: kinetic energy is when a object is moving. Potential energy is when something is at rest and has no movement what so ever

8 0

3 years ago

A 4-kg ball has a momentum of 12 kg∙m/s. what is the ball's speed?

Karolina [17]

M= 4kg
v= ?
momentum = Mv
so
12kgms-¹ = 4kg×v
v= 12÷4 = 3ms-¹

7 0

3 years ago

Read 2 more answers

A train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period

Sergio [31]

Answer:

2621.25 meters

Explanation:

First, write down what we are given.

Initial velocity = 27.5 m/s

Final velocity = 42.4 m/s

Time = 75 seconds

We need to look at the kinematic equations and determine which one will be best. In this case, we need an equation with distance. I am going to use $v_{f}^{2} = v_{i}^{2} +2ad$ , but you can also use the other equation, $x = v_{o}t+\frac{1}{2}at^{2}$

We need to find acceleration. To find it, we need to use the formula for acceleration: $a = \frac{v_{f}-v_{i}}{t}$ . Plugging in values, $a = \frac{42.4-27.5}{75} = .199\ m/s^{2}$

Next, plug in what we know into the kinematics equation and solve for distance. $42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters$

7 0

3 years ago