Question

A bowler throws a cricket ball at a speed of 36km/hr. How long does this ball
take to travel a distance of 20 metres to reach the batsman?
each of them
​

Answer 1

Question :–

A bowler throws a cricket ball at a speed of 36km/hr. How long does this ball take to travel a distance of 20 metres to reach the batsman?

Given :–

• A bowler throws a cricket ball at a speed of 36km/hr.

To Find :–

• How long does this ball
• take to travel a distance of 20 metres to reach the batsman?

Solution :–

First, change km into m.

→ $36 \times \frac{ \cancel{10} \cancel{00}}{ \cancel{36} \cancel{00}}$

→ $\cancel{36} \times \frac{5}{ \cancel{18} }$

→ $2 \times 5$

→ $10 \: m/s$

Now,

Time taken to travel 20m in the speed of 10m/s.

→ $\frac{ \cancel{20}}{ \cancel{10} }$

→ $\boxed{\tt\orange{2 \: sec}}$

Answer 2

✬ Time = 2 seconds ✬

Step-by-step explanation:

Given:

• A bowler throws a ball at a speed of 36 km/hr.
• The distance to be covered by ball is 20 m.

To Find:

• How much time ball will take to reach 20 m?

Solution: Changing the km/hr to m/s.

➟ To change into km/h to m/s , multiply with 5/18.

[ Speed of ball in m/s ]

➟ 36(5/18)

➟ 2(5)

➟ 10 m/s.

As we know that

★ Distance = Speed $\times$ Time ★

$\implies{\rm }$ 20 = 10 $\times$ t

$\implies{\rm }$ 20 = 10t

$\implies{\rm }$ 20/10 = t

$\implies{\rm }$ 2 = t

Hence, ball will take 2 seconds to reach the batsman.