Grade 11Mechanics

A body falls for 5s from rest. If the acceleration due to gravity of earth ceases to act, the distance it travels in the next 3s is
73.5m
294m
147m
49m

Amrutha

10 Years agoGrade 11

1 Answer

Neeti

Approved Tutor Answer10 Years ago

Initially the body starts it’s motion from rest therefore u = 0.

let this journey be A, when accelaration due to earth is acting on the body.

time = 5seconds. Let’s find v

v= u+ at

= 0 + 9.8 x 5

=49m/s

when accelaration stops acting, the velocity of the body is 49m/s

now the distance travelled by the body in the next 3s is

s= ut + 1/2gt²

= 49 x 3 + ½ x 0 x t2

= 49 x 3

147m

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A body falls for 5s from rest. If the acceleration due to gravity of earth ceases to act, the distance it travels in the next 3s is73.5m294m147m49m

Amrutha

1 Answer

Neeti

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