Question

A particle of mass m is projected at an angle $\alpha$ to the horizontal with an initial velocity u. The work done by gravity during the time it reaches its highest point is:

• A. $u^{2}si{n}^2\alpha$
• B. $\frac{m{u}^{2}co{s}^2\alpha }{2}$
• C. $\frac{m{u}^{2}si{n}^2\alpha }{2}$
• D. -$\frac{m{u}^{2}si{n}^2\alpha }{2}$

Answer 1

Answer: (A), (D)

The correct options are
A $u^{2}si{n}^2\alpha$
D -$\frac{m{u}^{2}si{n}^2\alpha }{2}$