Q. A car of mass 500 kg starts from rest and is acted upon by a forward force of 200 N due to engine and retarding force of 50 N. Calculate the velocity after 5 seconds.
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hence the velocity after 5 seconds will be 1.5 m per second
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ANSWER : 1.5 m/s
Explanation:
M = 500 kg
F = 200 N
f = 50 N
T = 5 sec
F = m (v-u)/t
v = final velocity
u = initial velocity
F = 500 (v-u)/5
F = 200N - 50N = 150N
150N = force ,, so we can write 150 instead of F .
150 = 500 (v-u)/ 5 ,,,,,, (100v-u) 100 is in standard form by the division of 5 and 500 .
150 = 100 (v-u)
150/100 = (v-u)
(v-u) = 1.5
= 1.5 m/s ---- answer .
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