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Ierofanga [76]
3 years ago
12

HELLPPP ASAPPPP!!!!!

Physics
1 answer:
OLga [1]3 years ago
4 0

Answer:

initial velocity=19 ms^{-1}

greatest height=48.05 m

Explanation:

Applying motion equations,

upward motion (g= -10m/s2)

where

u = initial velocity

v = final velocity

g = gravitational acceleration

s = distance

v^{2}=u^{2} +2gs\\31^{2} = u^{2}+2*(-10)*(-30)\\u^{2}=361\\u=19 ms^{-1}

2)when the rock is at the highest point the velocity = 0

v^{2}=u^{2} +2gs\\0=361-2*10*S\\S=18.05 m

total high to the highest point = 18.05 +30

                                                  = 48.05 m

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Answer:

F_{net}=0

Explanation:

It is given that, a proton moves at constant velocity, through a region in which there is an electric field and a magnetic field such that,

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We know that the net force in the region of magnetic and electric field is given by Lorentz forces. But here, the proton moves with constant velocity. So, the net force acting on it is 0.

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7 0
3 years ago
A student uses 60 Newtons of force to climb 18 meters in 6 seconds. Calculate her Power.
puteri [66]

Answer:

15

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2 years ago
A jet plane lands with a speed of 100 m/s and can
kiruha [24]

Answer:

a) t = 20 [s]

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Explanation:

To solve this problem we must use kinematics equations, it is of great importance to note that when the plane lands it slows down until it reaches rest, ie the final speed will be zero.

a)

v_{f}=v_{i}-(a*t)

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Vf = final velocity = 0

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t = time [s]

Note: the negative sign of the equation means that the aircraft slows down as it stops.

0 = 100 - 5*t

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b)

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x -x_{o}=(v_{o}*t)+\frac{1}{2}*a*t^{2}

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x -xo = (0*20) + (0.5*5*20^2)

x - xo =  1000 [m]

1000 [m] = 1 [km]

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4 0
3 years ago
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The statement can't be true. Objects with different masses held at the same height don't have the same gravitational potential energy.
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Makovka662 [10]

Answer:

20m/s

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it covers 20 metres in a second

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2 years ago
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