Advertisements
Advertisements
प्रश्न
A bowler throws a cricket ball at a speed of 120 km/h. How long does this ball take to travel a distance of 20 metres to reach the batsman?
Advertisements
उत्तर
The speed of the cricket ball = 120 km/h
= `(120 xx 1000)/60` m/min ...[∵ 1 km = 1000 m and 1 h = 60 min]
= 2 × 1000
= 2000 m/min
Now, speed in m/s = `2000/60` ...[∵ 1 min = 60 s]
= `200/6`
= `100/3` m/s
So, 20 m can be cover in `20/(100/3)` ...`[∵ "Time" = "Distance"/"Speed"]`
= `60/100`
= 0.6 s
APPEARS IN
संबंधित प्रश्न
A car is travelling at the average speed of 50 km/hr. How much distance would it travel in 12 minutes?
In 15 days, the earth picks up 1.2 × 108 kg of dust from the atmosphere. In how many days it will pick up 4.8 × 108 kg of dust?
A and B can finish a work in 20 days. A alone can do \[\frac{1}{5}\] th of the work in 12 days. In how many days can B alone do it?
If 25 men earn Rs 1000 in 10 days, how much will 15 men earn in 15 days?
Two taps A and B can fill an overhead tank in 10 hours and 15 hours respectively. Both the taps are opened for 4 hours and they B is turned off. How much time will A take to fill the remaining tank?
If the cost of 8 apples is ₹ 56 then the cost of 12 apples is _______
If C = kd
(i) what is the relation between C and d?
(ii) find k when C = 30 and d = 6
(iii) find C, when d = 10
A truck needs 54 litres of diesel for covering a distance of 297 km. The diesel required by the truck to cover a distance of 550 km is ______.
If the area occupied by 15 postal stamps is 60 cm2, then the area occupied by 120 such postal stamps will be ______.
A water tank casts a shadow 21 m long. A tree of height 9.5 m casts a shadow 8 m long at the same time. The lengths of the shadows are directly proportional to their heights. Find the height of the tank.
