Assertion A particle is projected with speed u at an angle `theta` with the horizontal. At any time during motion, speed of particle is v at angle `alpha` with the vertical, then `v sin alpha` is always constant throughout the motion.
Reason In case of projectile motion, magnitude of radical acceleration at topmost point is maximum.

Options

A. If both Asseration and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason is true

Answer

B

Explanation

Assertion `v sin alpha =` horizontal component of velocity = constant
Reason `a_(r) = sqrt(g^(2)-a_(t)^(2))`
At highest point `a_(t) =0`. Therefore, `a_(r)`is maximum.