Question

At a construction site a pipe wrench struck the ground with a speed of 24m/s. (a) From what height was it inadvertently dropped? (b) How long was it falling?

Answer 1

Answer:

(

a

)

29.4

m

(

b

)

2.45

s

Explanation:

(

a

)

v

2

=

u

2

+

2

a

s

This becomes:

24

2

=

0

+

2

×

9.8

×

s

∴

s

=

576

2

×

9.8

=

29.4

m

(

b

)

s

=

1

2

g

t

2

∴

t

=

√

2

s

g

∴

t

=

√

2

×

29.4

9.8

=

2.45

s