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Dafna1 [17]
3 years ago
7

2. A boy kicks the football of mass 500 g which is initially at rest. It starts moving with a

Physics
2 answers:
Zarrin [17]3 years ago
8 0

Answer:

mass 500g is converted into kg

500/1000=0.5kg

same 1/2=0.5

Explanation:

nikdorinn [45]3 years ago
4 0

Answer:

Below given

Explanation:

constant velocity of 5 m/s. Calculate:

(a) the kinetic energy of the boy

(b) the work done by the boy

[Ans.(a) 6.25 ), (b) 6.25]] can some on show me how the answer

came

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A or C

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A train starting from rest picks up a speed of 20 m/s in 20 s while travelling on a straight path. It continues to move at the s
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Answer:

1300 m

Explanation:

As the path is straight, so the speed is equivalent to velocity. Now. assuming that the acceleration and deceleration of the train are constant. So, change of velocity with respect to time for acceleration as well as deceleration is constant. Hence, the slope of the speed-time graph is constant for the time of acceleration as well as deceleration. The speed for the time from 20 s to 70 s is constant, so slope for this interval of time is zero. The speed-time graph is shown in the figure.

The total distance covered by the train during the entire journey is the area of the speed-time graph.

Area=\frac{1}{2}(20\times 20)+ 50\times 20+\frac{1}{2}(20\times 10)

=200+1000+100

=1300

As velocity is in m/s and time is in s so the unit of area is m

Hence, the total distance is  1300m.

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3 years ago
Which of the following correctly arranges the planets by the size of their diameter in increasing order?
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Consider two objects (Object 1 and Object 2) moving in the same direction on a frictionless surface. Object 1 moves with speed v
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Answer:

A)Object 1 has the greater magnitude of its momentum.

B)The objects 2 have the greater kinetic energy.

Explanation:

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For object 2 :

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KE_2=\dfrac{1}{2}\times m\times 4v^2

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