True or false The forehand and backhand strokes are commonly used for serving in Table Tennis.
1 answer:
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Answer
given,
mass of base ball = 0.14 kg
speed before it made the contact with the ball (V i) = 42 m/s
speed after batter hit the ball(V f) = - 48 m/s
a)
impulse = change in momentum
=
=
= -12.6 Kg m/s
Magnitude of impulse = 12.6 Kg m/s
b)
Force =
=
Force = 2520 N
Answer:
The initial speed of bullet is "164 m/s".
Explanation:
The given values are:
mass of bullet,
or,
mass of wooden block,
speed,
Coefficient of kinetic friction,
As we know,
The Kinematic equation is:
⇒
then,
Initial velocity will be:
⇒
On substituting the given values, we get
⇒
As we know,
The conservation of momentum is:
⇒
or,
⇒ Initial speed,
On substituting the values, we get
⇒
⇒
⇒