I THINK LINE [ D ] IS THE RIGHT ANSWER....
Explanation:
BECAUSE IN [ D ] THERE SHOWS MANY ANGLE AND THERE LIES BOTH POSITIVE VELOCITY AND POSITIVE ACCELERATION.......
HOPE IT HELP.......❣❣❣
Answer:
Explanation:
loss of energy while passing through target by bullet
= 1/2 mu² - 1/2 mv² , m is mass of bullet , u is initial velocity and v is final velocity .
= 1/2 x m ( u² - v² )
= .5 x .023 x ( 1100² - 950² )
= 3536.25 J.
This loss is due to negative work done by friction force
If friction force be F
Work done by friction force = F x .33
F x .33 = loss of kinetic energy
F x .33 = 3536.25
F = 10716 N
impulse of F
F X t , time period during which this force remains active
10716 x t = change in momentum of bullet
= .023 ( 1100 - 950 )
= 3.45
t = 3.45 / 10716
= 3.22 x 10⁻⁴ s.
Average force on the target = friction force created = 10716 N
Impulse by force on target = 10716 x 3.22 x 10⁻⁴
impulse on target = change in momentum of target
= mass of target x its velocity after impact
= 400 v
v = 10716 x 3.22 x 10⁻⁴ / 400
= 86.26 x 10⁻⁴ m /s
I believe it is surface waves because it happens at the surface of the water.
Answer:
Steven has to row at a speed to reach the same horizontal spot at the other side of the river is, V = 6 m/s
Explanation:
Given data,
The river flowing south at the rate, v = 3 m/s
To reach the other side directly across the river, he aims the raft, Ф = 30°
The speed of his raft across the river is given by the formula,
V = v / Sin Ф
= 3 / Sin 30°
= 6 m/s
Steven has to row at a speed to reach the same horizontal spot at the other side of the river is, V = 6 m/s