Question

Q:Distance covered by a freely falling body in 2 seconds will be..
A) 4.9 m
C) 39.2 m
B) 19.6 m
D) 44.1 m
​

Answer 1

x

1

=0+

2

1

(g)(1)

2

=5m

x

1

+x

2

=0+

2

1

(g)(2)

2

=20m⟹x

2

15m

x

1

+x

2

+x

3

=0+

2

1

(g)(3)

2

=45m⟹x

3

=25m

x

1

+x

2

+……x

n

=0+

2

1

(g)(n)

2

=5n

2

m⟹x

n

=5n

2

−[5(n−1)

2

]=10n−5=5+10(n−1)

⟹x

1

,x

2

,……x

n

forming an AP with d=10.

Answer 2

Answer:

Explanation:

After two seconds it will have fallen 1/2 × 9.8 × 22 = 19.6 meters.