Grade 10Mechanics

a body is thrown upwards with velocity of 100m/s and it travel 5m in the last second of its motion.if the same body is thrown upwards with a velocity of 200 m/s find the distance travelled by it in the last second of its journey

Ishan

8 Years agoGrade 10

1 Answer

Arun

8 Years ago

Dear Ishan

For case2 there is no effect of case 1.

Now

V² = u² - 2gS

0 = 200² - 2* 10 * S

40000/20 = S

S = 2000 metres

V= u + g*t

0 = 200 - 10 * t

t = 20 sec

In last second distance,

S₂₀ = u + (1/2) g *(2t-1)

= 200 - (1/2)*10* 39

= 200 - 195

= 5 metres

Regards

Arun (askIITians forum expert)

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a body is thrown upwards with velocity of 100m/s and it travel 5m in the last second of its motion.if the same body is thrown upwards with a velocity of 200 m/s find the distance travelled by it in the last second of its journey

Ishan

1 Answer

Arun

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