Question

starting point, did they cross each other second time?
1) 36 hours
2) 45 hours
4) 72 hours
3) 54 hours
A hunter sees a deer 200m away and immediately shoots an arrow which can travel at a
speed of 30 m/sec for 300 metres after which it drops down (immediately). At what speed
should the deer run so as to miss the arrow?
1) more than 10 m/sec
2) more than 30 m/sec
3) more than 5 m/sec
4) None of these​

Answer 1

Step-by-step explanation:

The deer must get more than 300 m from the hunter before the arrow reaches that distance. As it starts 200 m from the hunter, it runs just over 100 m to achieve this.

The arrow, travelling at 30 m/sec will take 300 / 30 = 10 sec to reach the 300 m mark. The deer must move just over 100 m in that 10 sec, that is just over 10 m / sec.

So answer a) more than 10 m/sec.