A passenger at the rear of a train traveling at 15 m/s relative to earth throws a baseball with a speed of 15 m/s in the directi
1 answer:
Answer:
0 m/s
Explanation:
Let's take the direction in which the train is travelling as positive direction. Therefore:
- The velocity of the train with respect to earth is:
- The ball is thrown with speed 15 m/s in the opposite direction, so in the frame of reference of the train, its velocity is
Therefore, the velocity of the baseball in the earth's reference frame will be the algebraic sum of these two velocities, so:
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Answer:
C) 4.0026 amu
Explanation:
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Answer:
a) 24 J
b) Gravitational Force
c) 45 J
d) 0
e) 6.782m/s
Explanation:
a) m = 3kg
v = 4m/s
h = 1.5m
KE = ?
0.5 * 3 * 16 = 24J
b) Gravitational force
c) F = ma = 3 * 10 = 30N
Work done = Force * distance = 30 * 1.5 = 45J
d) Final Kinetic Energy of the ball is zero because the ball eventually stops moving
e) velocity of ball as it strikes the ground = v
where
v is the velocity as it strikes the ground
u is the initial velocity
a is acceleration
s is the distance
Now since the ball is thrown downwards, a is positive because the velocity of the ball is increasing as the gravitational force acts on it
u = 4m/s
a = 10
s = 1.5
=>
=
=