Question

1) A bullet of mass 20g is horizontally fired with a horizontal velocity 150m/s from a pistol of mass 2kg. what is the recoil velocity of pistol?

2) a truck start from rest and rolls down a hill with a constant acceleration. it travels a distance of 400m in 20sec. find its acceleration. find the force acting on it if its mass is 7 metric tonnes. (1metric tonnes =1000kg)





please fast your answers

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Answer 1

1)let the recoil velocity of gun be X so by using the formula m
$m1 \times v1 = m2 \times v2$
so here M1 is 0.02
M2 is 2
V2 is 150
V2 is X
so
2 × X = 150 × 0.02
X = (150 × 0.02) ÷ 2
X = 1.5 m/s