On observing a sign board about speed limit, a driver applies brakes and reduces his speed from 100 m/s to 50 m/s though a distance of 50 m. The uniform retardation provided by the brakes (in m/s2) will be
♡ 25
♡ 75
♡ 50
♡ 10
Share
On observing a sign board about speed limit, a driver applies brakes and reduces his speed from 100 m/s to 50 m/s though a distance of 50 m. The uniform retardation provided by the brakes (in m/s2) will be
♡ 25
♡ 75
♡ 50
♡ 10
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Verified answer
Answer:
Explanation:
➜ Here we have to find the deceleration of the vehicle.
➜ By Newton's third equation of motion we know that,
v² - u² = 2as
where v = final velocity
u = initial velocity
a = acceleration
s = distance travelled
➜ Substitute the data,
50² - 100² = 2 × a × 50
100 a = 2500 - 10000
100 a = -7500
a = -7500/100
a = -75
➜ Hence the retardation of the vehicle is -75 m/s²
➜ Here acceleration is negative since it is retardation or deceleration.
➜ Hence option B is correct.
➜ The three equations of motion are: