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Problem
Problem
Assertion :
A particle is projected with velocity
u
\mathbf{u}
u
at angle
45
∘
45^\circ
4
5
∘
with ground. Let
v
\mathbf{v}
v
be the velocity of particle at time
t
(
≠
0
)
t (\neq 0)
t
(
=
0
)
, then value of
u
⋅
v
\mathbf{u} \cdot \mathbf{v}
u
⋅
v
can be zero.
Reason :
Value of dot product is zero when angle between two vectors is
90
∘
90^\circ
9
0
∘
.
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