AT&T; LTE 17:51 * 66% QUiz 2, Sep 2017 ar A is moving with a velocity of 20 m/s

Question

AT&T; LTE 17:51 * 66% QUiz 2, Sep 2017 ar A is moving with a velocity of 20 m/s and car ismoving with a velocity of-35mthe l velocity of carAwt Cars a) 35 m/s b)-35 m/s an apple from a car moving at 95 mles/hour on a road, the horontal alting vertically, so in onder to protect from rain, he should hold the umbrella bj inclined in forward direction d) Can be in forward or backward direction t a)invertical upward tion cl) inclined in backward direction 7) You are going to university in car when it starts raining lwithout any wind), then sometimes al front window is dry c) both windows are dry bj rear window is dry d) not sure which window will be dry 8. A boat is crossing a river with a velocity of 3 miles/hour. The river is flowing at 2 miles/hour and is width is 3 miles. The time taken by boat to cross the river is a) 1 hour b) 0.5 hour c) 1.5 hour d) 2 hours 9. A man starts walking in the cruise ship with a velocity of 5 miles/hour in the direction of ship which i moving at 10 miles/hour a) 5 miles/hour . The velocity of person as seen by passengers siting in the cruise ship is b) 15 miles/hour 10 miles/hourdo O miles/hour 10. Two race cars A and B are running at 120 miles/hour and 125 miles/hour in the same direction, the relative velocity of car A wrt Car B is a) 245 miles/hour b 5 miles/hour -5 miles/hour d) 62.5 miles/hour

Explanation / Answer

1 .the motion of the plane is two dimensional

3. angle=tan^-1[2/2]=45 degree

4.the relative velocity A w.r.to B Vab=20-(-15)=35 m/s

6 .the person hold umbarella vertically upwards

7.the front wind is dry because the car moving forward direction

8.time taken to cross the river t=3/[3^2-2^2]61/2=1.5 hour

9.the velocity of the person as seen by person sitting in the ship =10+5=15 mile/hour

10.the velocity A w.r.to B=120-125=-5 miles/hour

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