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Q.

A car is moving along a road with a speed of 45 km/hr. In what direction must a body be projected from it with a velocity of 25 m/s, so that its resultant motion is at right angles to the direction of car?

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a

At an angle of 1200 with the direction of motion of car.

b

At an angle of 600 with the direction of motion of car.

c

At an angle of 90o with the direction of motion of car.

d

At an angle of 1350 with the direction of motion of car.

answer is A.

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Detailed Solution

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vc = 45 km/h = 252m/s

For the resultant motion to be upwards.

v cos θ + vc = 0

cos θ = -vCv = -25225 = -12  θ = 1200

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A car is moving along a road with a speed of 45 km/hr. In what direction must a body be projected from it with a velocity of 25 m/s, so that its resultant motion is at right angles to the direction of car?