Question

4. A car is moving with a speed of 15 kmh−1 and another identical car is moving with a speed of 30 kmh−1. Compare their kinetic energy.​

Answer 1

Answer:

Two identical cars means , they have equal mass

K.E.=21mv2

Let m be the mass of each car 

Kinetic energy of car A = 21m×(15)2=2225m

Kinetic energy of car B = 21m×(30)2=450m

K.E.ofBK.E.ofA=2×450m225m=41=1:4

 K.E. of car B is 4 times K.E. of car A.

Answer 2

Answer:

Two identical cars means , they have equal mass

K.E.=

2

1

mv

2

Let m be the mass of each car

Kinetic energy of car A =

2

1

m×(15)

2

=

2

225

m

Kinetic energy of car B =

2

1

m×(30)

2

=450m

K.E.ofB

K.E.ofA

=

2×450m

225m

=

4

1

=1:4

K.E. of car B is 4 times K.E. of car A.

Explanation:

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