Question

A toy truck of mass 3 kg and speed, v, approaching a ramp of height 5 m. If the toy truck makes it to the top of the ramp, what is the value of v? (Hint: Law of conservation of energy)

Answer 1

Given,

A toy truck of mass 3 kg and speed, v, approaching a ramp of height 5 m. If the toy truck makes it to the top of the ramp.

To find: what is the value of v?

Solution:

In the bottom of the ramp, potential energy will be zero because there will be no height.

And the kinematic energy will be maximum.

According to the conservation of energy.

At the top of the ramp, the speed will be maximum. So the kinetic energy will be equal to the potential energy.

Hence.

`\begin{gathered} (1)/(2)mv^2=mgh \\ (1)/(2)mv^2=0 \\ v=0\text{ m/s} \\ \end{gathered}`

Thus, the value of v is 0 m/s.