Question

A block of mass m is taken from A to B slowly under the action of a constant force R Work done by this force is ______.

Options

• FR

• `pi/2`FR

• `"FR"/sqrt2`

• `"FR"/4`

Answer 1

A block of mass m is taken from A to B slowly under the action of a constant force R Work done by this force is FR.

Explanation:

A block of mass m is taken from A to B under constant force F.

∴ work done W = `vec"F"⋅vec"d"`

W_AB = `vec"F"_x⋅vec"R"_x + vec"F"_x⋅vec"R"_y`

= FR cos 0° + FR cos 90°

⇒ W_AB = FR