Question

The velocity of a bus is 72km/hour and that of a car is 40m/sec, then a) Car moves faster than bus b) Car moves slower c) Both moves with same velocity d) Can't say​

Answer 1

GIVEN:

A Bus moving with 72Kmph and a Car moving with 40m/s.

To Find:

Which is moving Faster of the both Bus or the Car.

Procedure:

1) The bus is moving with a speed of 72kmph where as the car is moving with a speed of 40m/s. Since both the units are of different physical quantities we have to convert the units of one of them.

2) Converting the speed of bus from kmph to m/s:

The speed of bus is 72kmph , From the relation 1kmph =(5/18)m/s, we can covert 72kmph into m/s.

3) 72kmph= 72 * (5/18) m/s

On mathematical calculation , we get:

=> 72kmph = 20m/s.

4) Therefore The speed of the bus is 20m/s whereas the speed of the car is 40m/s .

5) Since both are of similar units we can compare now, Therefore the car moves faster than the bus (OPTION A)

Answer 2

Explanation:

Given: The velocity of a bus is 72km/hour and that of a car is 40m/sec,

To find: Which option is correct.

a) Car moves faster than bus

b) Car moves slower

c) Both moves with same velocity

d) Can't say

Solution:

Tip: Velocity of bus and car should be in same unit to compare.

Step 1: Convert velocity of bus in m/sec

We know that

$\bf 1\:km = 1000 \: m$

and

$\bf 1 \: hour = 3600 \: sec$

So,

$72 \: km/hour = \frac{72 \times 1000}{3600} m/sec$

cancel out common factors of numerator and denominator.

$= \frac{72 \times 10}{36} m/sec$

or

$= 20 \: m/sec$

Therefore,

$\bf 72km/hour = 20 \: m/sec$

And velocity of car is 40 m/sec.

It is clear that 40 m/sec>20 m/sec.

i.e.

Velocity of car > Velocity of bus

Option A is correct.

Final answer:

Car moves faster than bus.

Option a is correct.

Hope it helps you.

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