A car is moving with a speed of 72 ,km/h towa | vedclass

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(C) The speed of the car is $v_c = 72 \,km/h = 72 	imes \frac{5}{18} = 20 \,m/s$.In $t = 10 \,s$, the distance traveled by the car is $d_c = v_c 	im

Vedclass · Accepted Answer

$340$

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(C) The speed of the car is $v_c = 72 \,km/h = 72 	imes \frac{5}{18} = 20 \,m/s$.In $t = 10 \,s$, the distance traveled by the car is $d_c = v_c 	imes t = 20 	imes 10 = 200 \,m$.Initially, the car is at $1800 \,m$ from the hill. After $10 \,s$, the car has moved $200 \,m$ closer to the hill, so its new distance from the hill is $1800 - 200 = 1600 \,m$.The sound travels from the car to the hill $(1800 \,m)$ and then reflects back to the car at its new position $(1600 \,m)$.Total distance traveled by sound $D = 1800 \,m + 1600 \,m = 3400 \,m$.Since the time taken is $10 \,s$, the speed of sound $v_s = \frac{D}{t} = \frac{3400}{10} = 340 \,m/s$.

$A$ car is moving with a speed of $72 \,km/h$ towards a hill. The car blows its horn at a distance of $1800 \,m$ from the hill. If the echo is heard after $10 \,s$, the speed of sound (in $m/s$) is:

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